How old is an aceliner stapler model no. 502?
The basic look of the Aceliner 502 was first patented under patent number 2311412, entitled Feed mechanism for stapling machines awarded to William G. Pankonin of Chicago, IL on February 16, 1943, though the patent includes an unconventional feed mechanism. A more recognizable approach to the feed mechanism is shown in patent number 2832959, entitled Stapling device, which was awarded to Pankonin on May 6, 1958.
