Fluid logic pulse frequency subtractor

Claim 1

A FLUID LOGIC PULSE FREQUENCY REVERSIBLE SUBTRACTOR DEVICE COMPRISING A PAIR OF FLUID SYSTEM, EACH COMPRISING A FLUID PULSE TRAIN INPUT, A CONTROL OUTPUT PASSAGE AS A FLUID FLIP-FLOP CONTROL MEANS, AND A BRANCH OUTPUT PASSAGE TO A PRESSURE SINK AS A READOUT MEANS, A FLUID FLIPFLOP OPERABLE BY SAID CONTROL OUTPUTS OF SAID FLUID SYSTEMS, WHEREIN SAID CONTROL OUTPUTS ARE OPPOSITELY DISPOSED WITH RESPECT TO EACH OTHER AT SAID FLIP-FLOP, AND WHEREIN UNDER OPERATING CONDITIONS, SAID FLIP-FLOP IS ESTABLISHED IN ONE OF ITS TWO STATES SUCH THAT ONE OF SAID CONTROL OUTPUTS IS AT A PRESSURE LOWER THAN SAID SINK PRESSURE, AND THE OTHER OF SAID CONTROL OUTPUTS IS AT A PRESSURE HIGHER THAN SAID SINK PRESSURE, SAID CONTROL OUTPUTS AND SAID FLIP-FLOP THUS PROVIDING MEANS WHEREBY A FIRST FLUID PULSE, BY OPERATING SAID FLIP-FLOP, ESTABLISHES, AT THE CONTROL OUTPUT OF THE SYSTEM OF SAID FIRST PULSE, A PRESSURE INCREASED TO A VALUE GREATER THAN THAT OF SAID SINK PRESSURE, AND AT THE CONTROL OUTPUT OF THE OTHER OF SAID SYSTEMS, A PRESSURE DECREASED TO A VALUE LESS THAN THAT OF SAID SINK PRESSURE, WHEREBY A SECOND FLUID PULSE IN SAID FIRST PULSE SYSTEM, ON ENCOUNTERING SAID INCREASED PRESSURE, IS DIVERTED FROM SAID FIRST PULSE CONTROL OUTPUT TO THE BRANCH PASSAGE OF THE SYSTEM OF SAID FIRST PULSE AS AN OUTPUT SIGNAL, SAID SYSTEMS BEING OPERATIVELY JOINED BY SAID PRESSURE RELATIONSHIPS IN THAT SAID SECOND PULSE IS SO DIVERTED ONLY IF THERE OCCURS TOW CONSECUTIVE PULSES IN SAID FIRST PULSE SYSTEM WITH NO PULSE IN THE OTHER OF SAID SYSTEM DURING THE TIME OF SID CONSECUTIVE PULSE OCCURRENCES, SAID OUTPUT SIGNALS IN SAID BRANCH PASSAGES COMPRISING AN ARITHMETIC SUBSTRACTION OF THE PULSES IN ONE OF SAID SYSTEMS FROM THE PULSES IN THE OTHER OF SAID SYS TEM WITH THE RESULT APPEARING IN THE READOUT BRANCH OF THE SYSTEM CARRYING THE HIGHEST FREQUENCY OF PULSES.