Abstract: A combination device for insulating a beverage vessel and removing a bottle cap is disclosed. This device includes a generally cylindrically-shaped insulating sleeve, a substantially planar and disk-shaped metal insert with a rectangular aperture that pries off a bottle cap, and a ring-shaped structure that stabilizes the insert within the insulating sleeve.

Abstract: An EKG signal processing apparatus comprising an input to which the EKG signal may be applied, an output at which the processed EKG signal is to appear, a resistor and a normally conductive signal switch connected in series between one terminal of said input and one terminal of said output, a capacitor connected across the output, a differentiator, and a bipolar comparator for providing a signal indicating the presence of a pace pulse at said input, and a signal switch control responsive to said signal for making said signal switch nonconductive for at least a portion of a pace pulse and until any voltage following the pace pulse has reached a low value.

Abstract: Apparatus for reducing the fundamental and harmonic frequencies of hum in a signal comprising means for placing a plurality of signal storage means between an input to which the signal is applied and an output in repeated sequence that is synchronous with the fundamental frequency of hum in such manner as to subtract the amount of signal stored from the signal passing between the input and output. The storage means are in a charging circuit having a time constant such that it requires a number of sequences to build the signal stored to its full amplitude.