ALVIN  No.1114     made in Switzerland                        (1950)
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1/8" is this curve meter's scale - common for architectural drawings 

Two SubScales:   "Thousand Feet"  &  "Hundred Feet"

It counts positive when shifted to the left - It has a RESET Button

impressum:
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© C.HAMANN       http://public.BHT-Berlin.de/hamann         08/09/10