Abstract: A interchangeable bore clarinet barrel system is provided which eliminates the need for substituting one clarinet barrel for another in order to change tone color, intonation, and response characteristics. The barrel system is attachable to adjacent portions of a clarinet and includes a barrel body and a bore removably attached to the body. The body may be in two sections, or a single-piece unitary barrel body. The bore may be frictionally fitted or threadedly received into the barrel body. Tone rings and sleeves allow alteration of the tone color, intonation and response characteristics of the clarinet.

Abstract: A combination measuring instrument such as an elongated and retractable tape measuring device is associated with an audio recording apparatus which enables a user to record measurements observed on the tape measure device simultaneously with the act of performing the measurement and which permits the subsequent playback of the recorded information for use in a later discrete step of manufacturing or utilizing the recorded information. The recording device may be positioned in or on the housing of the measuring device so that the user may conveniently record the observed measurement orally for later reuse.

Abstract: Handebars 50 contains one or more swivels 10. Swivel 10 are typically mounted between handelbar segments 11 and 12, and between segments 13 and 11 . Each swivel 10 comprises an inner tube 23, spring loaded buttons 28, adapter tube 31 and outer tube 25. Inner tube 23 is free to rotate within outer tube 25 only when buttons 28 are depressed.