| 摘要 |
535,924. Rubber sheets. INTERNATIONAL LATEX PROCESSES, Ltd. April 30, 1940, No. 7723. Convention date, May 13, 1939. [Class 70] [Also in Group XXXVI] A storage-battery pasteretaining envelope comprises an outer layer of perforated hard rubber. 8 and an inner layer of sponge rubber 6, which may be vulcanized. The two layers may be adhesively bonded. The outer layer may be the material described in Specification 470,900 and the inner layer that described in Specification 486,641. |
