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DIFF Subgroup
G02B 7/40

using time delay of the reflected waves, e.g. of ultrasonic waves

Introduced: January 1990

Full Title

Mountings, adjusting means, or light-tight connections, for optical elements > Systems for automatic generation of focusing signals > using time delay of the reflected waves, e.g. of ultrasonic waves

No child classifications to compare. This is a leaf node in both IPC and CPC.