Abstract: An apparatus for the delivery of a product having a delivery outlet, a delivery control device, a remote command device, and a mobile communications device is disclosed. The delivery control device is connected to the remote command device via a communications network and is adapted to activate the delivery outlet when in receipt of an activation signal from the remote command device. The mobile communications device is connectable to the remote command device via a communications network. The remote command device is adapted to send the activation signal to the delivery control device when in receipt of an activation request signal from the mobile communications device.

Abstract: An apparatus for the delivery of a product having a delivery outlet, a delivery control device, a remote command device, and a mobile communications device is disclosed. The delivery control device is connected to the remote command device via a communications network and is adapted to activate the delivery outlet when in receipt of an activation signal from the remote command device. The mobile communications device is connectable to the remote command device via a communications network. The remote command device is adapted to send the activation signal to the delivery control device when in receipt of an activation request signal from the mobile communications device.

Abstract: The coded acoustic alarm transmitter/receiver system includes a transmitter for selectively providing both an audible alarm in the audio frequency range and a silent alarm in the ultrasonic frequency range. These alarm signals may be provided by a plurality of signals of different frequencies transmitted simultaneously in either the audio or ultrasonic frequency ranges. Receiver units are tuned to receive specific frequencies from a specific transmitter or group of transmitters.

Abstract: A general purpose modular acoustic signal generator includes an outer casing unit having a plurality of disengageably connected sections and an insert unit removably positioned in that outer casing unit. The insert unit has a piezoelectric acoustic generator disc mounted thereon and defines a Helmholtz resonator on each side of the acoustic generator disc. A single outer casing is usable with a plurality of different insert units so a single outer casing unit can be associated with a plurality of different Helmholtz resonators.

Abstract: The personal acoustic alarm unit produces an audible alarm signal in the audio range to alert persons in the area of the signal transmitter. This audio alarm signal is formed by a plurality of simultaneously generated audio frequency sonic signals, each of which has a different audio frequency. Receiver units are turned to receive the audio frequency sonic signals from a specific transmitter or group of transmitters.