Many people contact this site with questions about antique cash registers. Most questions can be answered by obtaining a copy of the Yellow Book on Antique Cash Registers by Bartsch and Sanchez, and Volume I & II of the Incorruptible Cashier by Richard L. Crandall and Sam Robins. You could even ask your local library to order it for you. These books have a wealth of information. Of course, it would require a little effort on your part to actually research the info you need, but would be worth it for you in the long run.