The Metz Automobile Company built cars and motorcycles in Waltham from 1898 until 1922. Their main automobile factory occupied what was until very recently the Raytheon plant, and their offices were in the Gore mansion. Some claims to fame for Metz include the first U.S. production motorcycle, and a car with a continuously variable friction-drive transmission. Metz also produced bicycles in a factory on Rumford Avenue on the Island.
Some Metz links:
http://aaaim.com/echo/v1n4/metzmtn.htm
http://ftp.motorcycle.com/mo/mcmuseum/firstbike.html
http://www.geocities.com/MotorCity/Downs/7204/orient.html