| http://www.w3.org/ns/prov#value | - Low engine oil sensing switch Microsoft Academic Search A pneumatic switch is described responsive to the vacuum in a closed crankcase of a reciprocating piston engine, the crankcase containing a volume of lubricating oil, the engine having a check valve connected for venting positive gas pressure from the crankcase to maintain an average vacuum in the crankcase, such vacuum varying as a function
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