US PATENT SUBCLASS 236 / *
.~ Relay

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

67  DF  MOTORS {7}
*.~ Relay {2}
68 R  DF  .~.~> Auxiliary heater {4}
69  DF  .~.~> Pyrometer galvanometer {1}