Instructograph Morse Code Instructor Tape Machine 1930

You are bidding on a antique ... Instructograph Morse Code Instructor Tape Machine ... The ID label in the pop-off lid reads ... Mfg. by Instructograph Co. - 4701 Sheridan Road - Chicago, Illinois - Patent No. 1,725,145 ... Which dates this machine to around 1930, not real certain how it works? T is a crank, which I assume gerates power. Unit measures approximately 11" long, 7" wide and 9" tall. Untested but looks to be in Very Good Condition...