Abstract: A tissue sensing device and a method for placing the device. The device including a first electrically conductive needle; a non-conductive sheath receiving the first needle therein and allowing exposure of a portion the first needle at a distal end thereof; a second electrically conductive needle; and electronics coupled to the first and second needle, the electronics providing for sensing of capacitance between the first and second needles so as to provide an indication of a tissue in which the exposed portion of the first needle is located.

Abstract: One or more elongated base members are arranged to lie on the top surface of a building with their outer end portions projecting beyond the side of the building. These base members have a depending arm connected to the outer end portion thereof, and a scaffold for workmen is arranged to be suspended from such arms by suitable suspension lines or the like. The connection between the arms and their base members is adjustable on a horizontal axis so that the arms can be positioned at selected angles, including an acute angle, relative to the base member and arranged to extend under an overhang on the building if necessary. Workmen can thus be supported close to the side of the building even though the latter has an overhang.

Abstract: A pair of fluid operated cylinder assemblies are secured between the bunk of the trailer and a rear frame portion. An auxiliary motor, a pump driven by the motor, a reservoir, and a valve operated by solenoids to control driving functions for the pair of fluid operated cylinder assemblies is supported on the trailer. Control of the electric motor and the solenoids is accomplished by a switch located in the tractor and connected to the motor and solenoids by electric wires extending between the trailer and the tractor. The solenoids may be operated by radio receivers and remote transmitters rather than by a switch in the tractor.