FOUR LINES TRADING

Plumbing, Heating, and Air-Conditioning Contractors

NAICS #23822 | This industry comprises establishments primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment. Contractors in this industry may provide both parts and labor when performing work. The work performed may include new work, additions, alterations, maintenance, and repairs. Installing electrical controls for HVAC systems--are classified in Industry 238210, Electrical Contractors; and Duct cleaning--are classified in Industry 561790, Other Services to Buildings and Dwellings.

Computer and Electronic Product Manufacturing

NAICS #334 | Industries in the Computer and Electronic Product Manufacturing subsector group establishments that manufacture computers, computer peripherals, communications equipment, and similar electronic products, and establishments that manufacture components for such products. The Computer and Electronic Product Manufacturing industries have been combined in the hierarchy of NAICS because of the economic significance they have attained. Their rapid growth suggests that they will become even more important to the economies of all three North American countries in the future, and in addition their manufacturing processes are fundamentally different from the manufacturing processes of other machinery and equipment. The design and use of integrated circuits and the application of highly specialized miniaturization technologies are common elements in the production technologies of the computer and electronic subsector. Convergence of technology motivates this NAICS subsector. Digitalization of sound recording, for example, causes both the medium (the compact disc) and the equipment to resemble the technologies for recording, storing, transmitting, and manipulating data. Communications technology and equipment have been converging with computer technology. When technologically-related components are in the same sector, it makes it easier to adjust the classification for future changes, without needing to redefine its basic structure. The creation of the Computer and Electronic Product Manufacturing subsector will assist in delineating new and emerging industries because the activities that will serve as the probable sources of new industries, such as computer manufacturing and communications equipment manufacturing, or computers and audio equipment, are brought together. As new activities emerge, they are less likely therefore, to cross the subsector boundaries of the classification.

Computer Storage Device Manufacturing

NAICS #334112 | This U.S. industry comprises establishments primarily engaged in manufacturing computer storage devices that allow the storage and retrieval of data from a phase change, magnetic, optical, or magnetic/optical media. Examples of products made by these establishments are CD-ROM drives, floppy disk drives, hard disk drives, and tape storage and backup units. Manufacturing blank magnetic and optical recording media--are classified in U.S. Industry 334613, Magnetic and Optical Recording Media Manufacturing; Manufacturing semiconductor storage devices, such as memory chips,--are classified in U.S. Industry 334413, Semiconductor and Related Device Manufacturing; Manufacturing drive controller cards, internal or external to the storage device--are classified in U.S. Industry 334418, Printed Circuit Assembly (Electronic Assembly) Manufacturing; and Manufacturing other parts, such as casings, stampings, cable sets, and switches, for computer storage devices,--are classified in the Manufacturing sector based on their associated production processes.

Computer and Computer Peripheral Equipment and Software Merchant Wholesalers

NAICS #42343 | This industry comprises establishments primarily engaged in the merchant wholesale distribution of computers, computer peripheral equipment, loaded computer boards, and/or computer software. Merchant wholesale distribution of modems and other electronic communications equipment--are classified in Industry 423690, Other Electronic Parts and Equipment Merchant Wholesalers; and Selling, planning, and designing computer systems that integrate computer hardware, software, and communication technologies--are classified in U.S. Industry 541512, Computer Systems Design Services.

Other Professional Equipment and Supplies Merchant Wholesalers

NAICS #42349 | This industry comprises establishments primarily engaged in the merchant wholesale distribution of professional equipment and supplies (except ophthalmic goods and medical, dental, and hospital equipment and supplies). Merchant wholesale distribution of professional equipment, instruments, and/or goods sold, prescribed, or used by ophthalmologists, optometrists, and opticians, such as ophthalmic frames and lenses, and sunglasses,--are classified in Industry 423460, Ophthalmic Goods Merchant Wholesalers; Merchant wholesale distribution of medical professional equipment, instruments, and supplies used by medical and dental practitioners (except ophthalmic equipment, instruments, and goods used by ophthalmologists, optometrists, and opticians) and medical facilities--are classified in Industry 423450, Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers; Merchant wholesale distribution of silverware and plated flatware--are classified in Industry 423940, Jewelry, Watch, Precious Stone, and Precious Metal Merchant Wholesalers; Merchant wholesale distribution of books--are classified in Industry 424920, Book, Periodical, and Newspaper Merchant Wholesalers; and Merchant wholesale distribution of school furniture--are classified in Industry 423210, Furniture Merchant Wholesalers.

Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers

NAICS #42361 | This industry comprises establishments primarily engaged in the merchant wholesale distribution of electrical construction materials; wiring supplies; electric light fixtures; light bulbs; and/or electrical power equipment for the generation, transmission, distribution, or control of electric energy.

Electrical and Electronic Appliance, Television, and Radio Set Merchant Wholesalers

NAICS #42362 | This industry comprises establishments primarily engaged in the merchant wholesale distribution of household-type electrical appliances, room air-conditioners, gas and electric clothes dryers, and/or household-type audio or video equipment. Merchant wholesale distribution of gas household-type appliances (except gas clothes dryers)--are classified in Industry 423720, Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers; and Merchant wholesale distribution of nonhousehold-type video cameras--are classified in Industry 423410, Photographic Equipment and Supplies Merchant Wholesalers.

Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers

NAICS #42373 | This industry comprises establishments primarily engaged in the merchant wholesale distribution of warm air heating and air-conditioning equipment and supplies. Merchant wholesale distribution of household-type electrical appliances and room air-conditioners--are classified in Industry 423620, Electrical and Electronic Appliance, Television, and Radio Set Merchant Wholesalers; Merchant wholesale distribution of hydronic heating equipment--are classified in Industry 423720, Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers; and Selling and installing warm air heating and air-conditioning equipment--are classified in Industry 238220, Plumbing, Heating, and Air-Conditioning Contractors.

Radio, Television, and Other Electronics Stores

NAICS #443112 | This U.S. industry comprises: (1) establishments known as consumer electronics stores primarily engaged in retailing a general line of new consumer-type electronic products; (2) establishments specializing in retailing a single line of consumer-type electronic products (except computers); or (3) establishments primarily engaged in retailing these new electronic products in combination with repair services. Retailing electronic goods via electronic home shopping, mail-order, or direct sale--are classified in Subsector 454, Nonstore Retailers; Retailing automotive electronic sound systems--are classified in Industry 441310, Automotive Parts and Accessories Stores; Retailing new computers, computer peripherals, and prepackaged computer software without retailing other consumer-type electronic products or office equipment, office furniture and office supplies; or retailing these new computer products in combination with repair services--are classified in Industry 443120, Computer and Software Stores; Retailing new computers, computer peripherals, and prepackaged software in combination with retailing new office equipment, office furniture, and office supplies--are classified in Industry 453210, Office Supplies and Stationery Stores; Retailing new still and motion picture cameras--are classified in Industry 443130, Camera and Photographic Supplies Stores; Providing television or other electronic equipment repair services without retailing new televisions or electronic products--are classified in Industry 81121, Electronic and Precision Equipment Repair and Maintenance; Retailing new electronic toys--are classified in Industry 451120, Hobby, Toy, and Game Stores; and Retailing used electronics--are classified in Industry 453310, Used Merchandise Stores.

Computer and Software Stores

NAICS #44312 | This industry comprises establishments primarily engaged in retailing new computers, computer peripherals, and prepackaged computer software without retailing other consumer-type electronic products or office equipment, office furniture and office supplies; or retailing these new products in combination with repair and support services. Retailing computers and software via electronic home shopping, mail-order, or direct sale--are classified in Subsector 454, Nonstore Retailers; Retailing new electronic toys, such as video games and handheld electronic games--are classified in Industry 451120, Hobby, Toy, and Game Stores; Providing computer repair services without retailing new computers--are classified in U.S. Industry 811212, Computer and Office Machine Repair and Maintenance; Retailing new computers, computer peripherals, and prepackaged software in combination with retailing new office equipment, office furniture, and office supplies--are classified in Industry 453210, Office Supplies and Stationery Stores; Retailing a general line of new electronic products or specializing in retailing a single line of consumer-type electronic products (except computers)--are classified in U.S. Industry 443112, Radio, Television, and Other Electronics Stores; and Retailing used computers, computer software, video games, and handheld electronic games--are classified in Industry 453310, Used Merchandise Stores.

Software Publishers

NAICS #5112 |