device for measuring two solidarity network committed to back and one from the combined value of solidarity network committed to back up

摘要

A meter for indicating two related functions together with the summation of the values of the two functions by means of a pair of coaxially, separately driven pointers cooperating with a scale on a fare plate behind the needles and a function summation unit driving a pointer behind the fare plate and extending at least in part in front of the fare plate in cooperation with a second scale thereon.