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Switch mat
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Patent number 5,874,700
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Issue date Feb 23, 1999
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Preh-Werke GmbH & Co. KG
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard arrangement
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Patent number 5,747,758
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Issue date May 5, 1998
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Preh-Werke GmbH & Co. KG
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard with a protective foil
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Patent number 5,642,950
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Issue date Jul 1, 1997
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Preh-Werke GmbH & Co. KG
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Gerhard Hochgesang
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Push button switch
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Patent number 5,532,444
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Issue date Jul 2, 1996
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Preh-Werke GmbH & Co., KG
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Herbert Bonrath
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H01 - BASIC ELECTRIC ELEMENTS
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Push button switch
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Patent number 5,426,274
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Issue date Jun 20, 1995
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Preh-Werke GmbH & Co. KG
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Ulrich Bruggemann
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H01 - BASIC ELECTRIC ELEMENTS
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Push button switch
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Patent number 5,360,954
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Issue date Nov 1, 1994
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Preh-Werke GmbH & Co. KG
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Ulrich Bruggeman
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H01 - BASIC ELECTRIC ELEMENTS
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Keyboard with a metal carrier plate
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Patent number 4,773,780
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Issue date Sep 27, 1988
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Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. GmbH & Co.
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Gerhard Hochgesang
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Pushbutton switch device
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Patent number 4,720,609
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Issue date Jan 19, 1988
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Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. GmbH & Company
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS
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Multipole edge strip connector
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Patent number 4,531,793
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Issue date Jul 30, 1985
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Preh Elektrofeinmechanische Werke Jakob Preh Nach. GmbH & Co.
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS
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Coaxial plug connector
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Patent number 4,431,253
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Issue date Feb 14, 1984
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Preh Elektrofeinmechanische Werke Jakob Preh Nachf. GmbH & Co.
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Gerhard Hochgesang
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H01 - BASIC ELECTRIC ELEMENTS