Abstract: A single device for driving a pair of floppy discs, preferably the smaller mini floppy discs, is disclosed herein and identified as a dual floppy disc machine. A drive motor is coupled to a pair of rotatable spindles mounted side by side. The spindles receive respective floppy discs thereon, and are driven at a speed not to exceed 50 rpm, much lower than the speed of conventional floppy disc machines. A pair of read/write heads are provided which have a capacity of reading no more than 20,000 bits per second, again well below conventional rates but sufficient for the speeds used in the present invention. A single carriage has both read/write heads mounted thereon in spaced relationship, and is moveable along an axis bisecting a line connecting the centers of the spindles. As a result, the read/write heads are moveable in unison radially relative to the respective spindles. A stepping motor is coupled to the carriage to move the carriage along its axis.

Abstract: A true union ball valve comprising a body having a continuous axial chamber; a rotatable ball in the center of the chamber; a cylindrical seal carrier on each side of the ball, the diameter of the inner portion of each seal carrier being approximately equal to the diameter of the chamber and the diameter of the outer portion of each seal carrier being less than the diameter of the chamber to define an abutment in the outer surface of each seal carrier and a radial space between the outer portion of each seal carrier and the body; the body having an internal groove therein, perpendicular to the axis thereof, surrounding each radial space; a split locking ring positioned around each seal carrier, in the radial spaces; and a cam ring extendable into each radial space, from the ends of the valve body, between the seal carriers and the locking rings, for expanding the locking rings into the grooves in the valve body thereby wedging the locking rings between the grooves in the body and the abutments on the seal car