Steel square calculator
作者： Lutz Donald Clyde
DOI:
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摘要:
lens.org 参考文章(5)
Aegerter August Samuel, Direction measuring device ,(1931)
Raymond W Martin, Combined level, plumb rule, and clinometer ,(1922)
Preston R Bassett, Radio direction and position finder ,(1923)
Frank J. Korlick, Combined clinometer and computing instrument ,(1924)
Louis E Graves, Calculating device for electrical data, &c. ,(1907)