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F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16N—LUBRICATING
F16N23/00—Special adaptations of check valves
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FR533851D1921-04-061921-04-06
Improvements to the construction of pressurized flow lubricators
ExpiredFR533851A
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