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TIE  SLIDE  RULE    ( 6/8" / 41 mm Scales )



TIE SLIDE RULE   =   KRAWATTEN-KLAMMER-RECHENSTAB
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On the back side is engraved:
VERNON (= Manufacturer ?)   &   STERLING (= Silver ?)

impressum:
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http://public.beuth-hochschule.de/~hamann         08/03/07