Cambridge General Contractors . Trappcon has many years of experience being the prime contractor managing vendors, trades, and most importantly, communicating the necessary information to all parties throughout the building process to ensure the project meets your deadline, budget. Cambridge, ohio 43725 email info@cambridgeohiochamber.com phone and fax phone: Robert Bell Jr General Contractor Photo Gallery Cambridge MD from www.robertbellcontractor.com Founded with the vision of becoming one of the leading general contracting firms in san antonio and the surrounding area. Cambridge builders’ staff understands multifamily development projects and the distinct requirements for these projects with over sixty years of experience in this specialized field. C d hood building contractors.