Abstract: The present invention is a taut wire security system that is used with a perimeter fencing system. The device senses changes in the tension in the taut wire and produces a tension signal when a disturbance in the tension is created. This signal is transmitted to a central location when such a tension deviation occurs. The housing of the device has two compartments, with the electronic components being substantially sealed from the atmosphere such that moisture, dirt or other elements do not cause the electronic components to malfunction. The device also includes a tampering sensor to detect whenever the lid of the device is being removed.

Abstract: The present invention is a taut wire security system that is used with a perimeter fencing system. The device senses changes in the tension in the taut wire and produces a tension signal when a disturbance in the tension is created. This signal is transmitted to a central location when such a tension deviation occurs. The housing of the device has two compartments, with the electronic components being substantially sealed from the atmosphere such that moisture, dirt or other elements do not cause the electronic components to malfunction. The device also includes a tampering sensor to detect whenever the lid of the device is being removed.

Abstract: A security system including tracking units or readers carried or mounted on mobile units to operatively communicate status signals indicating identity, location, direction of travel, and a number of alarm conditions to a local monitoring station. The tracking units or readers are equipped with an infrared receiver to receive infrared location signals transmitted by fixed infrared transmitters located throughout the area to be monitored. Each infrared transmitter transmits a unique location signal. The tracking unit is operative to transmit a radio frequency watchdog signal that includes the last two location signals received, indicating the time lapsed since receipt of those location signals, a unique identification signal indicative of the and any applicable alarm signals triggered by predetermined conditions to which the tracking unit is also operative to detect.

Abstract: A system for monitoring the status of mobile units includes a module and a local station. The module attaches to the mobile unit and includes a sensor and transmitter. The module transmits signals to a receiver at the local station. The signals can indicate shock, tampering, or theft. The receiver delivers the signal to a computer at the local station. The computer stores and analyzes the data. The computer includes a display, a keyboard, and a printer. The computer is programmed to present the data to the user and is fitted with an internal card to dial a monitoring station.

Abstract: A hydraulic lifting jack has a base supported on wheels, an elevating linkage, a hydraulic ram operating with the linkage and a handle for pressurizing and releasing the hydraulic ram. An integral block of rugged rectangular configuration serves a multiple purpose of providing a reservoir for hydraulic fluid, mounting the ram, mounting the pump and providing exteriorly precision drilled bores for all the hydraulic activity.