IWA 1638.

Werns Decimal Point Slide Rule Calculator

Wern Inter AB, Strindbergsgatan 36A. 115 31 Stockholm, Sweden.

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Gold Medal Award 1966 at Brussels Invention Exhibition 1966.

50 Year Anniversary.

IWA 1638

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Manual Instructions for System Wern Decimal Point Slide Rule IWA 1638.

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