Adders, namely, calculators, electronic accumulators; acoustic couplers; alarm and signal devices for use in medical devices, namely, balance prostheses; analysis devices for analyzing data of patients position; antennae for use with receiver as part of positional balance prosthesis; electric apparatus for recording data from a positional balance prosthesis; apparatus for recording of distances, as part of the positional balance prosthesis; electric batteries; optical glasses; optical frames;...