摘要 |
<p>554,893. Asymmetrically-conducting resistances. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd., THOMPSON, L. E., and JENKINS, A. Jan. 21, 1942, No. 871. [Class 37] The selenium-mixture layer of a rectifier has a small quantity, within the limits 0.04 to 0.08 per cent, of sulphur, either alone or in combination, added to it. A small quantity of iron may also be added. Specifications 523,673 and 529,791 are referred to.</p> |