CONCISE, Tokyo / Japan                              (1970)
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                                               VERSION (A)

SCALES of the  CIRCULAR SLIDE RULE  » CONCISE  Model 28N «
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[ inverse / RED ]
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   D       X                              outer circle
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   C       X                              inner circles
   [CI]    [1/X]
   A       X2
   K       X3

R E M A R K S :     There are 2 Versions in the Collection
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On the back side of the slide rule is a circular reference
table with physical data - different design as Version (B)
and it has a LOGO on front.  It came in a yellow SP-Case.

Have a look at a Newer Version

                  Historical Remarks ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann   11/06/07