Abstract: An anti-snag plowing system suitable for clearing mines in the Middle East is disclosed. Advantageously, the plowing system has also been found to be an efficient and effective soil conditioner, making it a useful farming tool as well. The plowing system comprises several digging-knife units, or plows, and a harrow. Both are attached in tandem to a chain matrix, which is pulled with either a helicopter or tractor. The digging-knife units rotate if the digging-knives hit an immovable snag. The harrow is covered with a chain blanket, and may have magnetic or sonic wave mine triggers if the system is used for clearing mines. A symmetrical embodiment is also disclosed.

Abstract: A movable traffic barrier for dividing adjacent lanes of traffic in a roadway which includes a number of hollow cylindrical barriers laid end to end and projecting above the roadway, and a cable for rotating said cylindrical barriers to position them on the roadway.

Abstract: A system and method for regulating power demand in a power distribution system by means of time-of-day metering or remote control of energy-consuming appliances. The system provides means for producing control signals which can be reliably sent to numerous customers over a power distribution system from a central location. Means located at each electric power meter or controlled appliance monitors the signal on the power line to detect an incoming control signal. When a signal reaches the customer, a switch is operated either changing the metering rate or controlling the electricity supply to an appliance. Steps in the preferred method include modulating the line frequency by means of at least one signal frequency. The incoming power signal is continuously monitored at the customer load or meter and any control signals detected serve to actuate a load control switch or the like.