Opportunity Knocks

Opportunity Knocks is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Telemarketing Equipment & Services

North American Industry Classification System (NAICS) Categories:

• Other Electronic Parts And Equipment Merchant Wholesalers > Telephone & Telegraphic Equipment > Telemarketing Equipment
• Telemarketing Bureaus > Telephone Answering & Messenger Services > Telemarketing Services

Standard Industry Classification (SIC) Categories:

• Electronic Parts & Equipment > Telephone & Telegraphic Equipment > Telemarketing Equipment
• Business Services, Nec > Telemarketing Services