US2013024 Патенты
J. B. BOLLINGER BURGLARPROOF WINDOW SCREEN Filed Feb. l. , 1935 UNITED STATES PATENT OFFICE 2,013,024 BURGLARPRooF wINDow scREEN John B. Bollinger, San Francisco, Calif. Application February 1, 1935, serial No. 4,547 The present invention relates to improvements inburglar-proof window Screens and has particu lar reference to Sash windows; : . . The principal object of the invention is to pro noted that the window is substantially of stand ard construction and includes the frame 2 and the two sashes 3 and 4 slidable therein with free movements so as to cover the space left free by a dom of vert
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