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Service Companies for the Oil and Gas industry should be listed in the appropriate sub category, and not in the main category. Companies in the sub categories must provide either/or/and equipment, support, consultancy, information, staff and training and other services to oil and gas operating companies.
Software that deals exclusively with the oil and gas business (such as royalty payments, etc.) should be submitted here. Geological Software that is more general or is used in mining or other non-petroleum application should be submitted to Science: Earth Sciences: Geology: Software.

Software development organizations who just happen to have done some oil and gas work recently belong under some software or programming cat elsewhere in ODP.

Many vendors of data also sell software and vice versa. This category includes vendors selling data only, software only and both data and software.
Software that deals exclusively with the oil and gas business (such as royalty payments, etc.) should be submitted here. Geological Software that is more general or is used in mining or other non-petroleum application should be submitted to Science: Earth Sciences: Geology: Software.

Software development organizations who just happen to have done some oil and gas work recently belong under some software or programming cat elsewere in ODP.

Include service companies here. Companies manufacturing safety equipment should be in Oil and Gas/Tools and Equipment category.