Abstract: A pet feeding system includes a dish having an upwardly projecting elongated handle. A liner is shaped and dimensioned to fit over the dish. An anti-rotation mechanism prevents the liner from rotating with respect to the dish.

Abstract: In an apparatus and method for deterring and preventing forced entry intrusion into residential and commercial premises, the apparatus is a combination vertically operated dead bolt door lock surrounded by an alarm housing having battery means, a loud speaker, and a contact switch. The lock striker plate is mounted to the door frame as usual, but the lock is not mounted to the door at all, but rather is attached in suspension within the alarm housing. The alarm housing is attached to the door, and the lock within the housing is offset so as to float in spaced-apart relationship from the door on which the alarm housing is installed. Upon an intrusion effort, the door, together with the alarm housing will be shoved inward toward the premises by the intruder. But the lock floating within the alarm housing will be restrained by its engagement with the striker plate mounted to the door frame.

Abstract: An amplifier for use in an audio communication circuit between a dynamic microphone and an output line. The amplifier produces a signal at the output having characteristics similar to those of a signal from a carbon microphone, i.e., noise is suppressed in the output line when no speech signal is present. The amplifier includes a main channel including two stages coupled through two arms of a T-pad. In the absence of a voice signaal from the microphone, the third arm of the T-pad is effectively grounded through a saturated transistor and thereby holds the main channel in a low gain condition. A signal integrator responds to the output of the first stage and integrates excursions of the voice signal above a predetermined level. As the integrated signal increases, it shifts the transistor gradually away from its saturated condition, thereby gradually increasing the gain of the main channel in response to initiation of a voice signal at the microphone.