| 摘要 |
<p>527,714. Asymmetrically-conducting resistances. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd. April 12, 1939, No. 11111. Convention date, Jan. 7. [Class 37] In the production of copper-oxide rectifier elements such as have a coating of nickel upon the oxide surfaces, the coated element is subjected to concentrated nitric acid, as by dipping for about 1 second, and rinsed. This is stated to result in an improved rectifying action. Specifications 521,827 and 523,858 are referred to.</p> |
