Knapp J W

Knapp J W is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Excavating Contractors
• Septic Tanks & Systems Contractors & Dealers

North American Industry Classification System (NAICS) Categories:

• Plumbing, Heating, And Air-Conditioning Contractors > Septic Tanks & Systems
• Site Preparation Contractors
• Other Building Material Dealers > Septic & Drainage Products > Septic Tanks & Systems Wholesale

Standard Industry Classification (SIC) Categories:

• Plumbing, Heating And Air Conditioning > Septic Tanks & Systems > Septic Tanks & Systems Contractors & Dealers
• Excavation Work
• Construction Materials, Nec > Septic & Drainage Products > Septic Tanks & Systems Wholesale