Abstract: Disclosed is a digital computer memory system which coordinates between plural memories such that information recall from memories having different inherent access times results in a flow of only relevant data to the processor; this is accomplished in, for instance, a dual memory system, by synchronizing the operation of the memories such that the normal clock pulse of the computer strobes the output register of the faster (i.e., "normal") memory but a delayed clock pulse strobes the output register of the slower memory. Thus, because of the delayed strobe, the latter, as well as the former, has time to complete an access requested by the processor, and, consequently, transfer to the processor of incorrect or meaningless information is avoided.

Abstract: Disclosed is a circuit for locking a harmonic-rich oscillator, such as the crystal-controlled type, to provide as its output, a signal at a designated frequency characterized by minimum harmonic content and high stability. The circuit includes a combination of gates in the oscillatory feedback path controlled by single-shot multivibrators with time constants such that any tendency of the period of the output signal to compress or expand is overridden by the respective expansion or compression thereof by the appropriate single-shots.

Abstract: Disclosed is a guide in stylet form for aiding the insertion of catheters into, for instance, mucous canals of the living body for withdrawal of fluid from a cavity thereof, characterized by a core of solid, flexible metal completely encased in a self-lubricating material and an adjustable stop which also may be used as a grip for manipulation of the guide and an anchor for forming a handle by an end of the guide.