DENTAL INJECTION APPARATUS
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Abstract
APPARATUS FOR SLOWLY AND UNIFORMLY INJECTING LIQUID ANESTHESIA AND THE LIKE COMPRISING A SYRINGE HAVING A COMPRESSIBLE CARTRIDGE THEREIN CONTAINING THE ANESTHESIA, AND PISTON AND CYLINDER MEANS FOR EFFECTING COMPRESSION OF THE CARTRIDGE TO CAUSE THE DESIRED DISPENSING OF THE ANESTHESIA SAID APPARATUS COMPRISING A SUPPLY OF A VISCOUS FLUID, SUCH AS HYDRAULIC OIL, WHICH IS FORCED INTO SAID CYLINDER THROUGH A PORT LOCATED ON ONE SIDE OF THE PISTON AND IS FORCED OUT OF THE CYLINDER THROUGH A PORT LOCATED ON THE OPPOSITE SIDE OF THE PISTON, WHEREUPON MOVEMENT OF THE PISTON IS CUSHIONED BY THE VISCOUS FLUID.
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