Kurt Mehlhorn and Peter Sanders, Editors, Algorithms and Data Structures: The Basic Toolbox, Springer, Berlin, Heidelberg (2008) ISBN 978-3-540-77977-3, p. 300

A liquid basting injector for poultry or the like has a liquid container in which an inflatable bladder is positioned for cyclic inflation and deflation to effect pumping of liquid from the container through an outlet control air is provided through a shuttle valve from a line and a liquid control valve to injector needle. Control signal line connected to a delay means which vents the control line periodically to shift the liquid control valve to a closed position and to also shift an air control valve connected to the inflatable bladder to permit the bladder to be cyclically inflated and deflated to effect a pumping operation from the container. During deflation the container is refilled with fluid which during a cleaning mode of operation will be cleaning fluid but will be basting fluid during a basting mode of operation. In the basting mode of operation control of the liquid and gas control valve is also maintained by a timer to effect proper cycling of the control valve connected to the bladder and the liquid output line from the container. However, during the basting mode of operation it is necessary for the operator to position a finger over a control vent in the handle of the injector needle in order for the basting cycle to be initiated and in order for the cycle to continue. Thus, optimum control is provided for the operator. However, the timers provided in the pneumatic circuitry are adjustable for effecting the injection of a predetermined quantity of fluid as required for the particular circumstances.