共 50 条
- [34] A DIRECT-READING MICRODENSITOMETER JOURNAL OF SCIENTIFIC INSTRUMENTS, 1953, 30 (08): : 268 - 270
- [36] DIRECT-READING WAVEMETERS PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1947, 35 (02): : 179 - 179
- [37] WIDE-RANGE DIRECT-READING PRECISION FREQUENCY METER AND SIGNAL SOURCE PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1951, 39 (03): : 295 - 295
- [38] A DIRECT-READING PHOTOELECTRIC DENSITOMETER JOURNAL OF THE SOCIETY OF MOTION PICTURE ENGINEERS, 1939, 33 (04): : 403 - 409