Number | Name | Date | Kind |
---|---|---|---|
2724269 | Kalmus | Nov 1955 | |
3555899 | Yamamoto et al. | Jan 1971 | |
3641817 | Dory | Feb 1972 | |
3727458 | Parkinson | Apr 1973 | |
3751979 | Ims | Aug 1973 | |
3906791 | Lynnworth | Sep 1975 | |
4011755 | Pedersen et al. | Mar 1977 | |
4162630 | Johnson | Jul 1979 | |
4164865 | Hall et al. | Aug 1979 | |
4308754 | Pedersen et al. | Jan 1982 | |
4372166 | Loveland | Feb 1983 |
Number | Date | Country |
---|---|---|
2538788 | Mar 1977 | DEX |
Entry |
---|
K. S. Stull, Jr.-"Ultrasonic Phase Meter" Electronics, Sep. 1955, pp. 128-131. |