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  SDC13803.JPG - Notice that this is a half-keyboard calculator, usable for additions only. To type in the number 8, one has to enter first 5 and than 3. Pulling the right lever to the front zeroes the counter.The lever stays put, and springs back when the next key is punched.  
 
 
 
 
 

Notice that this is a half-keyboard calculator, usable for additions only. To type in the number 8, one has to enter first 5 and than 3. Pulling the right lever to the front zeroes the counter.The lever stays put, and springs back when the next key is punched. Download Original Image
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