38, Barrows Lock Works, North Chicago, 1939, pp. 457, 473-475.doi:USD248060 SDarrell, JackUSUSD248059 * May 9, 1977 May 30, 1978 Push symbol for glass doors or the likeUSD248060 * May 25, 1977 May 30, 1978 Push symbol for glass doors or the like...
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The mobile communication tubes (1) are round or, if required, square in cross-section, and the inlet and outlet aperture (2) provided can be opened and closed by remote control. Push doors (3) are fitted at the top and at the bottom in rails (7) and connected to the tubes (1). ...