Rodent exterminator

Claim 1

A RODENT EXTERMINATOR, INCLUDING MEANS DEFINING A PASSAGEWAY HAVING AN ENTRANCE OPENING AND AN EXIT OPENING FOR THE PASSAGE THERETHROUGH OF A RODENT, HYPODERMIC NEEDLE MEANS INCLUDING THE CUSTOMARY CYLINDER, PISTON AND HYPODERMIC NEEDLE, AND MOUNTED IN COOPERATIVE RELATION TO SAID PASSAGEWAY FOR RECIPROCATION WITH RESPECT THERETO SO THAT ITS NEEDLE MAY BE PROJECTED AND RETRACTED RELATIVE TO THE INTERIOR OF SAID PASSAGEWAY, THE RECIPROCATIVE MOUNTING OF SAID HYPODERMIC NEEDLE MEANS INCLUDING A LEVER ARM HAVING A FIXED PIVOT INTERMEDIATE ITS ENDS, ONE END OF SAID LEVER ARM CARRYING SAID HYPODERMIC NEEDLE MEANS AND ITS OTHER END BEING CONNECTED WITH ACTUATING MEANS FOR IMPARTING IT TO PIVOTAL MOVEMENT TO EFFECT THE DESIRED RECIPROCATION OF SAID HYPODERMIC NEEDLE MEANS, MEANS FOR FORCING THE PISTON OF SAID HYPODERMIC NEEDLE MEANS INWARDLY OF THE CYLINDER THEREOF AND OPERABLE WHEN THE NEEDLE IS PROJECTED INTO THE INTERIOR OF SAID PASSAGEWAY, TRIP MEANS ARRANGED IN SAID PASSAGEWAY, CONNECTIONS BETWEEN SAID TRIP MEANS AND THE ACTUATING MEANS OF SAID LEVER ARM AND OPERABLE IN THE PRESENCE OF A RODENT ON SAID TRIP MEANS TO TRIGGER THE ACTUATING MEANS OF SAID LEVER ARM AND THEREBY CAUSE THE NEEDLE TO BE INSERTED INTO THE BODY OF THE RODENT, WHEREUPON THE ACTUATING MEANS OF SAID PISTON WILL BE ACTIVATED TO FORCE A CHARGE OF LETHAL FLUID FROM SAID CYLINDER INTO THE BODY OF THE RODENT, MEANS FOR THEREAFTER RESTORING SAID LEVER ARM WITH THE HYPODERMIC NEEDLE MEANS TO ITS INITIAL POSITION TO THUS FREE THE POISONED RODENT FOR EXIT THROUGH THE EXIT OPENING THE PASSAGEWAY, AND MEANS FOR RESTORING SAID PISTON TO ITS INITIAL POSITION WITH RELATION TO SAID CYLINDER.