O L Jacobs' Sons

O L Jacobs' Sons is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Mechanical Contractors
• Heating Contractors

North American Industry Classification System (NAICS) Categories:

• Plumbing, Heating, And Air-Conditioning Contractors > Heating Contractors
• Plumbing, Heating, And Air-Conditioning Contractors > Mechanical Contractors

Standard Industry Classification (SIC) Categories:

• Plumbing, Heating And Air Conditioning > Mechanical Contractors
• Plumbing, Heating And Air Conditioning > Heating Contractors