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Flat plate solar boilers
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Patent number 4,307,706
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Issue date Dec 29, 1981
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Louis W. Parker
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F24 - HEATING RANGES VENTILATING
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Direct current motors
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Patent number 4,095,148
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Issue date Jun 13, 1978
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Louis W. Parker
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Solar steam boiler
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Patent number 4,076,025
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Issue date Feb 28, 1978
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Louis W. Parker
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F24 - HEATING RANGES VENTILATING
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Variable speed induction motor
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Patent number 4,019,104
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Issue date Apr 19, 1977
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Louis W. Parker
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER