Magnetic wand actuated toy
作者： Jack C Wilson , Harry W Wilson
DOI:
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摘要:
lens.org 参考文章(5)
Jr Gurdon R Abell, Gauge for measuring subatmospheric pressures ,(1944)
Jack C Wilson, Mystery toy or puzzle ,(1948)
Richard G Jewell, Adjustable strength permanent magnet ,(1946)
Walter H Gerber, Luminous scale rotameter ,(1940)
Kremer John, Disappearing image in bottle ,(1948)