| http://www.w3.org/ns/prov#value | - 7 *Aug 24, 1976Aug 9, 1977The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationSolar cell shingleUS4051466 *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 byCitin
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