Proceedings of IEEE, vol. 67, No. 4, 1979, pp. 641-651, N.Y., U.S.A., M. G. Maginness, "Methods and Terminology for Diagnostic Ultrasound Imaging System", p. 643, Col. 1, line 61-644, col. 2, line 7; FIGS. 3-9. |
Proceedings of IEEE, vol. 67, No. 4, 1979, 510-525, N.Y. 67, U.S.A.; G. S. Kino: "Acoustic Imaging for Nondestructive Evaluation": *Abstract; p. 516, Col. 2 line 8; FIG. 2a. |
"Development of Electronic Sector Scanning Flaw Detector Turbine Blades"; by Y. Satou et al. |
"Hitachi-Hyoron", vol. 64, No. 3, pp. 45-50, Mar., 1982. |
"Electronic Sector Scanning for Ultrasonic Diagnosis", by J. C. Somers; Ultrasonics; Jul. 1968, pp. 153-159. |