Adjustable shutter in hermetically sealed casing
United States Patent 3022549
US Patent References:
Magnetically controlled element
- - 2343813

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- - 2733486


Inventors:
Cummings, Ralph J.
Publication Date:
02/27/1962
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Assignee:
Cummings, Ralph J.
Primary Class:
49/64
Other Classes:
52/473, 52/788.100, 49/90.100, 160/107, 160/DIG.016, 137/159
International Classes:
E06B9/264; E06B9/26