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Wireless voice data gateway
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Patent number 7,782,876
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Issue date Aug 24, 2010
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VTech Telecommunications Limited
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Gary Rogalski
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Hybrid telephony device
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Patent number 7,076,278
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Issue date Jul 11, 2006
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VTech Telecommunications Limited
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James Kralik
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Audio signal expander apparatus
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Patent number 5,159,636
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Issue date Oct 27, 1992
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Video Technology Engineering, Ltd.
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Gary Rogalski
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H03 - BASIC ELECTRONIC CIRCUITRY