The Multiscan assembly in 1972, manufactured by Organon Teknika, Oss, Netherlands.

The inside of the transducer assembly of the Multiscan.
This transducer measured 80x10 mm, has 20 crystals and operated at 2.25 and 4.5 MHz.

sonogram of a sagittal section of the heart. Note the relatively low lateral resolution.
20 scan lines from the 20 crystals. No focusing technique was incorporated.

Source: Bom, N.,Lance, C.T., Van Zweten, G.,Kloster, F.E. and Roelandt, J. (1973) Multiscan Echocardiography 1. Technical description. Circulation 48:1066-1074.

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