About sic code

标准产业分类( SIC )代码是由4位数字组成,由美国政府为了对商业机构确定其主营业务而建立. 方便收集,描述和分析数据; 并为了加强统一性和可比性,由联邦政府的各个机构包括 国家机构和私人组织 提供统计数据. 分类涵盖所有经济行为:农业,林业,渔业,狩猎和捕杀; 采矿; 施工; 制造业; 运输; 通信,电力, 天然气和卫生服务; 批发贸易; 零售贸易; 金融; 保险和房地产; 个人,企业,专业,修理 娱乐及其他服务; 公共行政. 
Reading a sic code:
前两位数字是识别主要行业， 第三位数字确定产业类别，第四位表示具体产业.
FOR EXAMPLE：
36 电子和其他电子设备
367 电子零件和配件
3672 印刷电路板
NOTE：数字9如果用在第3位或第4位表示未分类的混杂产业，这个混杂产业不包括相似的小团体活动。。。。

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http://www.osha.gov/pls/imis/sic_manual.html

This major group includes establishments primarily engaged in rendering services, not elsewhere classified, to business establishments on a contract or fee basis, such as advertising, credit reporting, collection of claims, mailing, reproduction, stenographic, news syndicates, computer programming, photocopying, duplicating, data processing, services to buildings, and help supply services. Establishments primarily engaged in providing engineering, accounting, research, management, and related services are classified in Major Group 87. Establishments which provide specialized services closely allied to activities covered in other divisions are classified in such divisions.

Industry Group 731: Advertising
·	7311 Advertising Agencies
·	7312 Outdoor Advertising Services
·	7313 Radio, Television, and Publishers' Advertising Representatives
·	7319 Advertising, Not Elsewhere Classified
Industry Group 732: Consumer Credit Reporting Agencies, Mercantile
·	7322 Adjustment and Collection Services
·	7323 Credit Reporting Services
Industry Group 733: Mailing, Reproduction, Commercial Art And Photography, and Stenographic Services
·	7331 Direct Mail Advertising Services
·	7334 Photocopying and Duplicating Services
·	7335 Commercial Photography
·	7336 Commercial Art and Graphic Design
·	7338 Secretarial and Court Reporting Services
Industry Group 734: Services To Dwellings And Other Buildings
·	7342 Disinfecting and Pest Control Services
·	7349 Building Cleaning and Maintenance Services, Not Elsewhere
Industry Group 735: Miscellaneous Equipment Rental And Leasing
·	7352 Medical Equipment Rental and Leasing
·	7353 Heavy Construction Equipment Rental and Leasing
·	7359 Equipment Rental and Leasing, Not Elsewhere Classified
Industry Group 736: Personnel Supply Services
·	7361 Employment Agencies
·	7363 Help Supply Services
Industry Group 737: Computer Programming, Data Processing, And Other Computer Related Services
·	7371 Computer Programming Services
·	7372 Prepackaged Software
·	7373 Computer Integrated Systems Design
·	7374 Computer Processing and Data Preparation and Processing Services
·	7375 Information Retrieval Services
·	7376 Computer Facilities Management Services
·	7377 Computer Rental and Leasing
·	7378 Computer Maintenance and Repair
·	7379 Computer Related Services, Not Elsewhere Classified
Industry Group 738: Miscellaneous Business Services
·	7381 Detective, Guard, and Armored Car Services
·	7382 Security Systems Services
·	7383 News Syndicates
·	7384 Photofinishing Laboratories
·	7389 Business Services, Not Elsewhere Classified