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Additions or tax scale???by Printsid
1960 - Dietzgen Slide Rule Instruction Manualby aghcoll…
enginners/students slide rule-possibly 1940s or 50s?by michael…
K & E Slide Ruleby zzzzipster
Pickett All Metal Slide Rule Model N 200-ESby nfalcone
Miller's Beam and Scale Ruleby HolDol