Paid, about $1
| Division was implemented on later models | 
Interesting calculator for the late 1960's made in Japan.  Use the brass stylus to drag down the toothed rails and count away.  Like an abacus, with numbers. Sure, adding is a cinch, good luck doing multiplication or any type of division on this.
| Two wrongs make 93.315 | 
 
There was an algorithm to do multiplication and division that came with the instruction manual for these types of calculators.
ReplyDeleteNo luck needed :P