US PATENT SUBCLASS 310 / 344
.~.~.~ Sealed unit

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

300  DF  NON-DYNAMOELECTRIC {4}
311  DF  .~ Piezoelectric elements and devices {17}
341  DF  .~.~ With temperature modifier and/or gas or vapor atmosphere control {3}
344.~.~.~ Sealed unit

DEFINITION

Classification: 310/344

Sealed unit:

(under subclass 341) Subject matter including an airtight housing around the crystal element.

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343, for sealed enclosures which are heated.

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174, Electricity: Conductors and Insulators,

8+, 17.05+ and 50.5+ for hermetically sealed housings combined with an electric circuit element which may be a piezoelectric element.