Can testing machines

Claim 1

A MACHINE FOR AUTOMATICALLY TESTING CANS FOR LEAKS AND FOR AUTOMATICALLY REJECTING CANS WHICH CONTAIN LEAKS, COMPRISING A ROTATABLE APERTURED SUPPORT ARRANGED TO MOVE CANS IN A PREDETERMINED PATH DURING TESTING THEREOF, SEPARATE MEANS COOPERATING WITH THE SUPPORT TO RETAIN THE OPEN EDN OF A CAN TO BE TESTED IN GAS-TIGHT ENGAGEMENT WITH SAID SUPPORT OVER EACH APERTURE, SAID APERTURED SUPPORT BEING MAINTAINED IN CONTACT WITH A FIXED CENTRAL HUB, SAID HUB HAVING A SUPPLY OF PRESSURIZED GAS, A GAS LINE ASSOCIATED WITH EACH APERTURE, A SUPPLY VALVE FOR INTRODUCING GAS UNDER PRESSURE TO SAID GAS LINES FROM THE SUPPLY OF PRESSURIZED GAS WITHIN SAID HUB IN TIMED RELATIONSHIP TO THE ROTATION OF SAID APERTURED SUPPORT ABOUT SAID CENTRAL HUB, A TRANSDUCER COMPRISING A FIRST AND A SECOND CHAMBER SEPARATED BY AN ELECTRICALLY CONDUCTIVE DIAPHRAGM AND A FLAT ELECTRODE MOUNTED IN ONE OF SAID CHAMBERS SO AS TO FORM A PARALLEL PLATE CAPACITOR WITH THE CHAMBER SEPARATING DIAPHRAGM, A GAS ISOLATING VALVE CONNECTED TO THE TRANSDUCER, A COARSE LEAK DETECTOR CONNECTED BETWEEN THE ISOLATING VALVE AND THE SUPPLY VALVE, ELECTRO-MAGNETIC MEANS FOR REJECTING CANS HAVING LEAKS THEREIN, SAID COARSE LEAK DETACTOR HAVING PRESSURE SENSITIVE MEANS FOR DETECTING A LEAK IN A CAN AND FOR ACTUATING SAID ELECTRO-MAGNETIC MEANS, SAID ISOLATING VALVE BEING DISPOSED IN SAID GAS LINE AND ISOLATING SAID FIRST CHAMBER AND SAID SECOND CHAMBER FROM SAID SUPPLY VALVE, AND ELECTRICALLY ACTUATED MEANS CONNECTED TO THE TRANSDUCER AND OPERABLE THEREBY TO ACTUATE SAID ELECTRO-MAGNETIC MEANS IF SAID CAN HAS A LEAK THEREIN.