A Direct‐Reading Frequency Meter Suitable for High Speed Recording
1931 ◽
Vol 19
(4)
◽
pp. 659-663
◽
1931 ◽
Vol 19
(8)
◽
pp. 1506-1507
1924 ◽
Vol 37
(1)
◽
pp. 97-100
1945 ◽
Vol 44
(4)
◽
pp. 257-262
2007 ◽
Vol 50
(2)
◽
pp. 215-220
◽
1948 ◽
Vol 8
(1)
◽
pp. 16-16