KEUFFEL&ESSER.CO DUPLEX DECITRIG N4081-3 1947 /CASE
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Faber-Castell Model Number 2/83N Slide Rule
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Sun Hemmi Slide Rule -- Japan
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K & E Keuffel & Esser 620022 Drafting Planimeter
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KEUFFEL & ESSER CO. N.Y. SLIDE RULE PAT. 6-5-1900 LONG1
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SANS & STREIFFLE #311 SLIDE RULE w/ LEATHER CASE 12"
OMICRON 30" CAPACITY ELLIPSOGRAPH. TOP OF LINE MODEL
Pickett Vintage Slide Rule N109-ES Simplex Trig Rule
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SLIDE RULE TIE CLIP
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KEUFFEL & ESSER CO. N.Y. SLIDE RULE PAT. 6-5-1900 10" L
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