Number | Name | Date | Kind |
---|---|---|---|
2635388 | Peyches et al. | Apr 1953 | |
3151958 | Bodine | Oct 1965 | |
3284991 | Ploeger et al. | Nov 1966 | |
3904392 | Van Ingen et al. | Sep 1975 |
Number | Date | Country |
---|---|---|
458893 | Dec 1936 | GBX |
Entry |
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Ultra-Sonic Engineering, A. E. Crawford pp. 230-233, Academic Press Inc. |