VTG K&E/KEUFFEL & ESSER N-4053-5 20" WOODEN POLYPHASE SLIDE RULE & 10" 4053-3

A terrific collection - TWO K&E WOODEN SLIDE RULES! 

K&E, KEUFFEL & ESSER 

POLYPHASE, MANNHEIM TYPE

WOOD

N4053-5, 20 1/2" END TO END

NICE SHAPE, NORMAL SIGNS OF USE & AGE

4053-3, ABOUT 10 3/4" END TO END, PATENT 1900

STARTING TO YELLOW WITH AGE, NORMAL SIGNS OF USE & AGE

BOTH HAVE HANDY REFERENCES & FORMULAS ON THE BACK

MADE IN USA

ORIGINAL CASE & INSTRUCTIONS NOT INCLUDED

GREAT FOR DISPLAY!