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Survival suit
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Patent number 4,547,904
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Issue date Oct 22, 1985
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Diving Unlimited International, Inc.
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Richard W. Long
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A41 - WEARING APPAREL
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Non-return hot water diving suit
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Patent number 4,274,759
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Issue date Jun 23, 1981
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Diving Unlimited International, Inc.
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Richard W. Long
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Diver's gas heater
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Patent number 4,013,122
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Issue date Mar 22, 1977
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Richard William Long
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F28 - HEAT EXCHANGE IN GENERAL