v5 
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pin optical equipment, and construc- 
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421 ST. PAUL STREET ROCHESTER, N.Y. 
oO 
»® IcallitThe machine 
ay with the Super HumanBrain: * 
He was speaking of the 
Rem 4 oe t05n 
Adding and Subtracting 
e 
PV ow “Per ter 
(Wahl Adding Mechanism) 
This machine does something that only the 
brain, directing the hand, has hitherto been able 
to do—that is, write and add (or subtract) on the 
same page. 
But this is not all. It does such work mure 
ea ily, more rapidly, and more accur.uey than the 
human brain has ever performed similar labor. 
Thus the machine is human in what it does 
and super-human in the way it does it. 
Ilustrated booklet sent on rearest 
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325-331 Broadway, New York 
Branches Everywhere 
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GRAND RAPIDS, MICH. 
Use the Coupon 
FROM U. OF C. JOURNALS 
Name__ 
Address 
