- Peter W. Dahl Co. Tel. 915-751-2300 Fax. 915-751-0768 Email pwdco@pwdahl.com The Peter W. Dahl Co. Inc. originated as a sole proprietorship in 1964, and was subsequently reorganized as a corporation under the laws of the state of Texas on May 2nd, 1977. Full Engineering, Manufacturing and Management capability ...www.pwdahl.com