Month in the Patent Office: A Selection from Important Aircraft and Aero Engine Specifications Published Recently

No. 325,041. Aircraft spars. —Chorlton, A. E. L., 55, Lower Belgrave Street; Haig, R. A. de H., 5, Clarendon Street, and Stieger, H. J., 76, Somerset Road, Wimbledon, all in London. Dec. 7, 1928, Nos. 36,131/28 and 18,692/29. [Classes 4 and 20 (iv).]