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Publication of FR454518ApublicationCriticalpatent/FR454518A/en
E05B51/00—Operating or controlling locks or other fastening devices by other non-mechanical means
E05B51/02—Operating or controlling locks or other fastening devices by other non-mechanical means by pneumatic or hydraulic means
FR454518D1913-02-181913-02-18
Improvement in the layout and construction of the organs that open the doors by moving an air column
ExpiredFR454518A
(en)