US Patent Office № 2,406,288 — Aug.20, 1946.
US Patent Office № 2,406,289 — Aug.20, 1946.
US Patent Office № 2,406,290 — Aug.20, 1946.
US Patent Office № 2,408,928 — Oct.8, 1946.
US Patent Office № 2,413,264 — Dec.24, 1946.
US Patent Office № 2,413,850 — Jan.7, 1947.
US Patent Office № 2,416,128 — Feb. 18,1947.
US Patent Office № 2,432,259 — Dec.9, 1947.
US Patent Office № 2,456,478 — Dec. 14, 1948.
US Patent Office № 2,456,542 — Dec. 14, 1948.
US Patent Office № 2,459,470 — Jan. 18, 1949.
US Patent Office № 2,459,975 — Jan.25, 1949.
US Patent Office № 2,466,236 — April 5, 1949.
US Patent Office № 2,475,496 — July 5, 1949.
US Patent Office № 2,487,397 — Nov.8, 1949.
US Patent Office № 2,627,832 — Feb. 10, 1953.