A O System

A O System is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Optical Equipment Machinery & Supplies

North American Industry Classification System (NAICS) Categories:

• Ophthalmic Goods Merchant Wholesalers

Standard Industry Classification (SIC) Categories:

• Ophthalmic Goods > Ophthalmic Goods, Nec > Optometrists Equipment & Supplies