For your enjoyment is this very nice manual titled Slide Rule Manual Polyphase Duples Trig No. 4070. This one is rated a B with some wear. Noticed one page with a tear to edge. Item # CB-31.
ISBN # : N/A Cr. 1939
# Of Pages: 87
Color Pictures: No
Hard or Soft Cover: Soft
Condition Rating;
A - = Like new with very little apparent use.
B+ = Minor wear from use and may have a few spots
B = Some wear from use and may have several spots
B - = Considerable wear from use and may have several spots
C+ = Considerable wear,spots and writing (other than previous owners name)
C = Major wear,spots and writing (other than previous owners name)
C - = Usable but not pretty
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