APPARATUS AND INSTRUMENTS FOR MEASURING AND INDICATING MECHANICAL QUANTITIES, PARTICULARLY FORCE, BY ELECTRICAL METHODS AND MEANS IN PRESSURE DIE-CASTING MACHINES AND INJECTION MOULDING MACHINES, SAID APPARATUS AND INSTRUMENTS CONSISTING OF STRAIN GAUGES, PRINTED CIRCUIT BOARDS, IMPULSE GENERATING MEANS, ELECTRONIC COUNTERS, DIGITALTO-ANALOG CONVERTERS, ELECTRICAL INDICATING INSTRUMENTS, POINTER INSTRUMENTS, DIAL GAUGES, DIGITAL INDICATING INSTRUMENTS, INSTRUMENTS FOR LIMITING VALVE CONTACTS,...