| http://www.w3.org/ns/prov#value | - US4051466 *Jul 11, 1975Sep 27, 1977Eltra Kg Leicht & TrambauerArrangement for detecting the presence of snow, ice and other freezing precipitation, particularly on railway track structures, and the like* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS4254382 *Mar 19, 1979Mar 3, 1981Motorola, Inc.Crystal oscillator temperature compensating circuitUS4412188 *Fe
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