| http://www.w3.org/ns/prov#value | - A systemor the character described-comprising: an internal combustion engine having a crank case and an ignition system including a source of electric current and an ignition switch, in combination with a float in the crank case responsive to the oil level therein, a master switch operatively connected with the float to be closed by the latter when the oil level recedes below a predetermined eleva
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