| http://www.w3.org/ns/prov#value | - The microcomputer 31 is constructed by: an internal counter (not shown); an ROM (not shown) in which operating procedures have been stored; an RAM (not shown) which is used as a data work area or a temporary shunt area when coordinates are calculated; a non-volatile memory (not shown) for storing constants (for example, constants such as frequency f, phase velocity Vp, group velocity Vg, and the l
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