Abstract: An apparatus for assisting a vocalist to hear the vocalist's own voice has a mixing chamber defining a first passage for communicating with an ear canal of a vocalist and an opening that is open to atmosphere. The mixing chamber includes a ball and socket joint having a passage in communication with the first passage. An ear piece is connected to the ball and socket joint and has a passage in communication with the first passage. A stabilizing ear retainer shaped to engage the outer ear of the vocalist is connected to the mixing chamber and mounts and retains the apparatus to the vocalist's ear. A voice tube is configured to extend from proximate a mouth of the vocalist and is connected to the mixing chamber. The voice tube defines a passage having an opening for collecting vocal sound from the vocalist an opening in communication with the first passage.

Abstract: Apparatus for loading and unloading a vehicle comprising a supporting frame having a pair of parallel spaced horizontally extending elongated tracks supported near the ends thereof by upstanding legs and elongated cross members operatively secured to said tracks adjacent the upper ends of said legs thereby defining a loading space within said frame. A hoist carrier is mounted on the tracks for movement longitudinally thereof. The carrier lies substantially within the plane of the tracks near the top of the space. A hoist boom is pivotally mounted on the carrier adjacent one of the tracks, the boom extending horizontally beneath the carrier and being swingable across the space between the tracks. The boom is also movable with the carrier longitudinally of the frame.