4. Metal working
  5. Means to assemble or disassemble
  6. Puller or pusher means, contained force multiplying operator

E-Tech, Inc.

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Connection assembly

Automatic temperature and humidity regulation – Exchange heaters – Thermostatic
Patent

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Dual control thermostat circuit

Electric heating – Heating devices – With current connection and/or disconnection means
Patent

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Helically flighted heat exchanger

Heat exchange – Three non-communicating fluids
Patent

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Method of manufacturing a heat exchanger

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent

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