Hartzell Machine Works – ESTABLISHED 1937 Since 1937, Hartzell has been a trusted name in custom precision machining. Some of our previous history was with Monotype typesetting molds, which were used in the casting of … Since 1937, Hartzell has been a trusted name in custom precision machining. Some of our previous history was with Monotype typesetting molds, which were used in the casting of …