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Otto Zumkeller
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Individual
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Publication of GB191318504ApublicationCriticalpatent/GB191318504A/en
E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
Landscapes
Closing And Opening Devices For Wings, And Checks For Wings
(AREA)
Lock And Its Accessories
(AREA)
Abstract
18,504. Zumkeller, O. Aug. 14. Operating doors by springs.-A pair of swing doors a carry arms c, c between which is tensioned a spring d which tends to throw them open.
GB191318504D1913-08-141913-08-14Improvements in Locks and Operating Devices for Doors.
ExpiredGB191318504A
(en)