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1971 - Vibra Screw Bin Calculator Data Chartby aghcoll…
1974 - Tank Volume Calculator Slide-Chartby aghcoll…
1962 - Tank Volume Calculator Slide-Chartby aghcoll…
Levis 501 Shrink to Fit Size Calculator (1984)by Legenda…
Neuhöffer & Sohn brass rule scale calculator ???by mordaunt
TI - 83 Plusby planbetter
Early Texas instruments deviceby musikchoo
Freemason Old Blackballing Secret Voting Box!by toracat
Do you know what this is and what it is used for?  Hensoldt Wetzlar Pentagram?by LYNNMANAGER
1930's victor adding machineby Trey
Victor Adding Machine by mosk
Toy Adding Machineby picking…
MONEY CLIP CUFF LINK SETby CAD1949
MECHANICAL PRODUCTION COUNTERby CAD1949
Monroe high speed adding calculatorby rickgron
1986/89-psion organiser cm and lz.by michael…
1973-sinclair cambridge calculator-1st model-type 1.by michael…
Burroughs Adding Machineby aycocko…
EarlySmall Computerby DaveB
curta calculatorby slide
My favourite Contex itemsby Raketten
1889 adding machineby vwrinkle
Early 1900's Wales Adding Machine / Beautiful Beveled Glass Sidesby choclatedonut
calculatorby chele
Monroe #1 High Speed Adding Calculatorby nespedal
1968 Curta Iby colorad…
My Goodwill Findby Kimmyras
1908 Burroughs Adding Machine with Beveled Glassby potrero