Abstract: Indicators for a stringed musical instrument having a fingerboard and strings stretched over the fingerboard. The indicators indicate the pitch produced when the string is pressed down against the fingerboard and plucked or bowed. There may be indicators for some or all of the twelve half steps of a chromatic scale (A; A.music-sharp., which is equivalent to B.music-flat.; B; C; C.music-sharp., which is equivalent to D.music-flat.; D; D.music-sharp., which is equivalent to E.music-flat.; E; F; F.music-sharp., which is equivalent to G.music-flat.; G; and G.music-sharp., which is equivalent to A.music-flat.). The indicators may be colored black and white like a piano keyboard. The invention includes a method for making portions of musical instruments having such indicators.

Abstract: An aneroid volume determining system includes an airtight chamber for holding a subject whose volume is to be detected; a volume adjuster including an inflatable container for varying the pressure in the chamber; sensing equipment including a pressure transducer for sensing the pressure in the chamber in the deflated and inflated states of the container; and controlling equipment, which can calculate the volume of the subject in response to the pressure sensed in the chamber with and without the subject present in the chamber and which equipment provides control signals to the volume adjuster for automatically controlling the inflation and deflation of the inflatable container.

Abstract: An inventory control system for a plurality of storage areas is provided wherein each storage area comprises at least one platform adapted to support a plurality of identical articles, and platform-supporting means including transducer means for providing a first electrical signal which varies in accordance with changes in the load carried by the platform-supporting means. The system also includes signal processing means for processing the first signals and producing in response to each first signal a second signal which is representative of the number of articles supported by the corresponding platform, scanning means for causing each of said first signals to be selectively coupled to said signal processing means, and means for providing an inventory record in response to said second signals.