Abstract: A point of purchase advertising system is provided which senses the presence of a person in the vicinity of an advertising display and thereupon renders an appropriate advertisement such as a recorded verbal message or a visual or aural demonstration. In preferred forms, the overall apparatus includes an ultrasonic sensing circuit for detecting the approach of a potential customer, an advertisement giving device, typically an endless tape playback unit and a coupled speaker, and a controller for operation of the playback unit in response to detection of a customer. A voice operated relay circuit is advantageously coupled with the audio output of the playback unit and the playback controller, so that operation of the playback unit is maintained until the entire recorded advertisement has been given.

Abstract: A sling intended primarily as a temporary expedient may be instantly attached to a firearm and slipped over the user's shoulder for transport of the firearm in that manner. The sling is of essentially one-piece construction, comprising basically a ribbon of flexible material such as woven nylon fabric that has a series of eyelets at one end thereof and a socket at the opposite end thereof. After a selected one of the eyelets has been slipped over the projecting end of the barrel and drawn down against the stock, the socket may be slipped onto the butt of the firearm to complete attachment and ready the firearm for over-the-shoulder transport. The complete absence of fasteners, buckles, clamps and swivels facilitates rapid attachment and detachment, and the sling may be coiled into a compact spiral or otherwise compactly folded for storage in a convenient pocket of the user.

Abstract: A flexible coupling tube corrects misalignment between gas meter and corresponding meter bar connections. The combination of meter bar and flexible coupling allows use of a single size meter bar for any gas meter installation. Potential damage to meter installations from external shock loads is reduced by the shock-absorbing properties of the flexible couplings.