| http://www.w3.org/ns/prov#value | - tal washer to said crystal and tubing at the coextensive ends thereof, and means for applying excitation to said crystal including a first terminal means on the outside surface of said crystal and a second terminal means on the outside wall of said tubing. 25 References Cited by the Examiner UNITED STATES PATENTS RICHARD B. WILKINSON, Primary Examiner.
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