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Two-wire transmitter
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Patent number 4,242,665
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Issue date Dec 30, 1980
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Action Instruments Company, Inc.
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David J. Mate
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G08 - SIGNALLING
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3898554
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Patent number 3,898,554
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Issue date Aug 5, 1975
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G08 - SIGNALLING
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3893192
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Patent number 3,893,192
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Issue date Jul 1, 1975
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G08 - SIGNALLING
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3887864
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Patent number 3,887,864
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Issue date Jun 3, 1975
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G08 - SIGNALLING
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3518886
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Patent number 3,518,886
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Issue date Jul 7, 1970
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G08 - SIGNALLING
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3517556
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Patent number 3,517,556
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Issue date Jun 30, 1970
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G08 - SIGNALLING
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2597088
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Patent number 2,597,088
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Issue date May 20, 1952
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2280775
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Patent number 2,280,775
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Issue date Apr 28, 1942
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G08 - SIGNALLING
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1995594
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Patent number 1,995,594
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Issue date Mar 26, 1935
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G08 - SIGNALLING