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http://www.google.com/patents/US2401779?utm_source=gb-gplus-share
Patent US2401779 - SUMMING AMPLIFIER
SUMMING AMPLIFIER
Karl D. Swartzel
› Overview
Abstract
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Description
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Patent number
: 2401779
Filing date
: May 1, 1941
Issue date
: Jun 11, 1946
Inventor
:
Karl D. Swartzel
Original Assignee
:
Bell Telephone Laboratories
Current U.S. Classification
:
330/69
;
324/123.00R
;
324/140.00R
;
326/35
;
327/361
;
330/90
;
330/96
;
330/97
;
330/98
;
330/102
;
330/128
;
330/147
;
330/184
;
330/191
;
330/198
;
330/200
;
330/203
;
708/801
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