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CONCISE 28 / PAN_AM
( 8 cm Diameter )
CONCISE, Tokyo / Japan (1960)
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SCALES of the CIRCULAR SLIDE RULE » CONCISE Model 28 «
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D X outer circle
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C X inner circles
CI 1/X
A X2
K X3
On the back side is the » PAN AMERICAN AIRLINE « LOGO:
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