Helical
Chamber's Twientieth Century Dictionary · 1908 · p. 48
Helicidæ , Helicograph , Helicoid . See Helix .
Bu kavram başka kaynaklarda da geçiyor
Hawkins' Electrical Dictionary (1915)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopedic Medical Dictionary (1893)
The Century Dictionary: The Encyelopedic Lexicon of the English Language (1887)
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