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Preparation of porphin,substituted porphin and metal chelates thereof
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Improvements in or relating to Temperature-Responsive Force-Transmitting Devices
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Temperature responsive force transmitting device
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Thermal sensitive element
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Double action thermostat
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Temperature responsive force transmitting device
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Power element
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Thermally expandable actuator means for thermal switch
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Acyl hydrazine compositions and methods of producing color therewith
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Squeeze-push power element
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Regulator device for electric current
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Heating element
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Multi-range expansion material
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Thermal element
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Polyethylene expansion material
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High temperature material
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Power element having novel forcetransmitting plug
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Power element
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Power element construction
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Power element
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