KEUFFEL & ESSER, New York / USA        SN = 025749         (1960)
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S C A L E S   of  the   P O C K E T   » SIMPLEX «    Model 4150-1
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                                               ( one-sided only )
   DF       πX
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   CF       πX
   CI       1/X
   C        X
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   D        X
   L        lgX

R E M A R K S :
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This "simplex" SR  came in a nice green leather case with a clip.

                     Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       05/23/14