Abstract: An airway device having a first passage open at one end to the atmosphere and carrying a mouthpiece at the other end through which a patient may breathe. A second passage opens into the first passage for communication with the outlet of a medication nebulizer. The airway device also has a tubular section extending into the first passage for communication with the negative air pressure sensing port of a positive pressure breathing machine which upon sensing inhalation by the patient causes actuation of the nebulizer to apply the nebulized medication through the airway device to the patient's lungs during the inhalation phase only of each breathing cycle while allowing the patient to breathe freely into the atmosphere.

Abstract: An improved snap hook of the type having a hook and rigidly fixed eye extending from the hook and a swingable keeper arm connected on the hook, and having a foot portion normally spring-urged into blocking relation of the passage through the eye of the hook and wherein the foot includes a surface arranged to bite into a line passed through the eye in one direction of rotation and yieldable storing energy in the spring upon movement of the line in the other direction of rotation to bitingly and clampingly engage the line automatically against applied forces tending to move the line in the direction in which it is to be restrained.

Abstract: A dental impression tray fastened to teeth in one quadrant, supports through a semi-rigid, non-resilient member, an electric transducer having an input probe positioned against the lingual surface of a tooth. A strip chart recorder is electrically coupled to the transducer and produces a graph in response to movement of the tooth caused by externally manually applied bi-directional forces on the tooth. A special tool is employed to apply forces, being adapted not only to movement of molars, but also incisors.

Abstract: A dental impression tray fastened to teeth in one quadrant, supports through a semi-rigid, non-resilient member, an electric transducer having an input probe positioned against the lingual surface of a tooth. A strip chart recorder is electrically coupled to the transducer and produces a graph in response to movement of the tooth caused by externally manually applied bi-directional forces on the tooth. A special tool is employed to apply forces, being adapted not only to movement of molars, but also incisors.