US Patent Class 136
BATTERIES: THERMOELECTRIC AND PHOTOELECTRIC-- Main Headings



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CLASS NOTES
200  DF  THERMOELECTRIC {15}
243  DF  PHOTOELECTRIC {2}
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CROSS-REFERENCE ART COLLECTIONS
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290  DF  TESTING, CALIBRATING, TREATING (E.G., AGING, ETC.)
291  DF  APPLICATIONS {2}