Patent 3328526 - 3328526

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United States Patent Patent Number 3,328,526
Issue Date: Issued June 27, 1967

Current U.S. Class: 380/39 - 369/2601 - 455/39
Current International Class: G10L021/00 (20060101)
H04K01/00 (20060101)
Current CPC Class: G10L 21/00 (20130101); H04K 1/00 (20130101); H05K 999/99 (20130101)


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