Title:
Electromagnetic display device
Document Type and Number:
United States Patent 3036300


Inventors:
Knight, John R.
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Publication Date:
05/22/1962
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Assignee:
IBM
Primary Class:
340/815.620
Other Classes:
40/503, 40/449, 345/111
International Classes:
G09F9/37
US Patent References:
2415452Electrical indicating device
2585974Electrical indicating device
2740955Magnetic annunciator
2836773Electrically controlled magnetic movement


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