Abstract: A trailer for transport, positioning and removal of grave-site supports by one workman provides a U-shaped base frame supporting an upstanding peripheral frame that carries an upstanding storage bin for tools and accessories required for set up of the grave-site support and supports a hoist structure. The U-shaped base frame defines a rearwardly opening medial space within which the grave-site support is carried for transport while allowing trailer positioning over the grave-site support for removal and placement. The hoist provides a depending tension element interconnecting plural connector elements which interconnect the grave-site support for vertical motion for positioning and transport.

Abstract: Control system for maintaining selected pressure in a gas distribution system including a header and multiple takeoffs from the header including a compressor to supply gas to the header at selected pressure range, a control valve in the header upstream of the first takeoff, an actuator to operate the valve to modulate flow to the header, a pressure transducer to measure the pressure of the gas in the header between the valve and the first takeoff, a controller to receive a signal from the pressure transducer and generate a controller signal corresponding to a valve position required to maintain the flow of gas to the header to maintain the selected pressure and a position control device to receive the controller signal and an electronic position feedback signal from the actuator to indicate the position of the valve with a comparator to compare the valve position signal with the controller signal and an operator to operate the actuator to move the valve in a direction to the position where the position feedba