| 摘要 |
581,307. Constant - temperature containers. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and POWERS, S. J. Sept. 1, 1944, No. 16726. Drawings to Specification. [Class 64 (ii)] [Also in Group XL] An evacuated container for a piezo-electric crystal has two spaced walls with a heating coil between them so that the temperature of the crystal may be kept constant. |
