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DORIC K & E CO. SLIDE RULE 9068 With Trigonometrical Scales Divided to Represent Degrees and Minutes INSTRUCTION MANUAL
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K+E Polyphase Duplex Pocket Slide Rule Manual No. 68 2059 with Trigonometrical scales Divided to Represent Degrees and Minutes
[rk. 3]
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K & E Slide Rule #4161 With Scales Similar...
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K + [and] E slide rule [no.] 4161: With scales similar to the Polyphase, but with folded scales DF and CF, and with trigonometric scales T, ST, and S ... to represent degrees and decimals of a degree
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