US PATENT SUBCLASS 136 / 223
.~ Having an evacuated space

Current as of: June, 1999
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136 /   HD   BATTERIES: THERMOELECTRIC AND PHOTOELECTRIC

200  DF  THERMOELECTRIC {15}
223.~ Having an evacuated space

DEFINITION

Classification: 136/223

(under subclass 200) Apparatus which includes a sealed space which is at substantially less than atmospheric pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

216, for evacuated radiation pyrometers.