Rapid USA Vintage Pinwheel Mechanical Calculator Manual Antique MIssing Cover

Description

This is a vintage antique Rapid Mechanical calculator. Everything seems to be working.
Not sure what the pin stick that is taped to the back is for.
It is missing the cover. This is from a friends Estate, his Father used this all the time.
The rubber feet are smushed down, they are not sticky, just firm squashed rubber.
This pinwheel calculating machine has nine levers for setting numbers, ten wheels for recording numbers of revolutions of the large drum, and 18 wheels for recording results. The large handle for operating the machine is on the right at the top. The carriage has two zeroing handles. Lifting a movable bar zeros the levers. Depressing a knob at the front releases the carriage. The machine has a wooden base.
A mark on the front of the machine and on the front of the cover reads: RAPID (/) CALCULATOR. MADE IN USA.  A mark on the front of the carriage reads: THE RAPID CALCULATOR CO. (/) PHILADELPHIA PENNA. A mark on the side has #7849
Otto P. Schuman (1891–1969) came to the United States from Germany in 1909 and founded the Rapid Calculator Company in 1919. He applied for U.S. patents on calculating machines in 1919 (1,508,257 - granted September 9, 1924 ) and 1924 (1,566,978 - granted December 22, 1925). The clearing mechanism for the entry levers patented in his second patent is used in this machine, hence the date of about 1925.