(under subclass 155) Subject matter wherein the geometrical measurement is a vertically measured distance between a reference base and something above or below it.
SEE OR SEARCH THIS CLASS, SUBCLASS:
97, for calibration or correction of a length, distance, or thickness measurement system.
158+, for a system to measure linear distance or length.
163+, for a system to measure rotary distance or length.
170, for a system to measure thickness or width.
SEE OR SEARCH CLASS
33, Geometrical Instruments, 719, for sound-type depth indication.
