| 摘要 |
505,167. Cathode-ray tubes. RADIOAKT.-GES. D. S. LOEWE. Oct. 1, 1937, No. 3119/39. Convention date, Oct. 2, 1936. Divided out of 503,207. [Class 39 (i)] To increase the contrast in light intensity in a television - receiving tube the cathode-ray in the form E is passed through a diaphragm B with a curved gap as shown ; the variation in intensity is non-linear. |
