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Details and Image
Item#
Type
Model No.
Match No.
Variant No.
Model Name
Maker
Country
Production or Serial No.
Material
Scale Length
Date
Condition
KEU191
Linear
4090-3
4539
n/a
Log Log Trig
Keuffel & Esser
USA
455132
Engine divided celluloid laminated mahogany
"10"
1933
C5
Notes:
Frameless glass indicator with plastic guides and protective flaps. All notations on reverse of slide rule above LL0 scale. Patent notation: PAT.APRIL 1.'24 OTHER PAT. PENDING.
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Condition Code
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