oldbiscuit Here are two more Sargent patents for locks with unique master keying.SARGENT - Google Patents MASTER-KEY PIN-LOCK - Google Patents
Pschiffe oldbiscuit wroteHere are two more Sargent patents for locks with unique master keying.SARGENT - Google Patents MASTER-KEY PIN-LOCK - Google Patents Henry B. Sargent was president of Sargent & Co. from 1917 to 1927 per Locks and Lockmakers of America, Revised Third Edition by Thomas F. Hennessy. Pete Schifferli [unknown]
