Abstract: A sewer cleaning machine includes a frame, a drum rotatably supported by the frame, and a motor supported by the frame and coupled to the drum. The drum includes a cable that is selectively extendable out of the drum. The motor is operable to rotate the drum. The drum is configured to engage a surface to facilitate moving the sewer cleaning machine along the surface.

Abstract: A guitar neck joint routing system. The system includes a probe and router assembly comprising a gantry, a probe, and a plurality of routers, and a guitar neck and body nest comprising clamps and vacuum grips for holding a guitar neck and guitar body in place for taking measurements and routing a dovetail joint.

Abstract: A guitar neck joint routing system. The system includes a probe and router assembly comprising a gantry, a probe, and a plurality of routers, and a guitar neck and body nest comprising clamps and vacuum grips for holding a guitar neck and guitar body in place for taking measurements and routing a dovetail joint.

Abstract: A guitar neck joint routing system. The system includes a probe and router assembly comprising a gantry, a probe, and a plurality of routers, and a guitar neck and body nest comprising clamps and vacuum grips for holding a guitar neck and guitar body in place for taking measurements and routing a dovetail joint.

Abstract: A pipe cleaning assembly includes a main shaft defining an inner bore aligned along a first axis, the inner bore being able to couple in fluid communication with coiled tubing. A slide shaft is disposed around the main shaft, the slide shaft having a forward end, a rear end, and a plurality of fluid pathways. Each of the fluid pathways is in fluid communication between the forward end of the slide shaft and the read end of the slide shaft. Each of the fluid pathways has a forward end able to direct fluid toward an inner surface of a pipe. The slide shaft is able to slide along the main shaft between a first position and a second position, in the direction of the first axis. The first position permits fluid flow through the plurality of fluid pathways, from the rear end of the slide shaft to the forward end of the slide shaft. The second position restricts fluid flow through the plurality of fluid pathways, from the forward end of the slide shaft to the rear end of the slide shaft.

Abstract: A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of gas-generating devices providing volumes of gas that are fed to refractory heat resistant tubing assemblies and flexible general tubing assemblies. The heat resistant and general tubing assemblies extend between adjacent gas generating devices and are provided with at least one row of holes to vent bubbles of gas and form a virtually continuous curtain of bubbles rising to the surface of the water between detonating explosives and areas of interest. The curtain of bubbles mitigates the effects of the explosions on marine mammals and endangered, threatened, or protected species within an area adjacent to the explosions.

Abstract: A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of gas-generating devices providing volumes of gas that are fed to refractory heat resistant tubing assemblies and flexible general tubing assemblies. The heat resistant and general tubing assemblies extend between adjacent gas generating devices and are provided with at least one row of holes to vent bubbles of gas and form a virtually continuous curtain of bubbles rising to the surface of the water between detonating explosives and areas of interest. The curtain of bubbles mitigates the effects of the explosions on marine mammals and endangered, threatened, or protected species within an area adjacent to the explosions.

Abstract: A pickup device for use with a fabric piece handling system for picking up and placing fabric pieces. The device includes a frame and a pair of opposed jaws moveably attached at one end to the frame. The head portion of each opposed jaw includes a fabric contact surface having an array of fabric engaging teeth for urging a portion of the fabric piece into a bunched condition for pickup and a gripping surface adjacent to the fabric contact surface for engagement with the other opposed jaw for picking up the fabric piece. A fluid operated piston is attached between the frame and the pair of opposed jaws for moving the pair of opposed jaws between a first position wherein the pair of opposed jaws are in an unobstructed open position to allow a piece of cloth to freely pass into a position between the pair of opposed jaws and a second position wherein the pair of opposed jaws are in an operative clamping position with respect to each other to clamp a piece of cloth therebetween.

Abstract: Stacks of fabric plies are sequentially positioned by a carousel feeding apparatus in an unloading position where the uppermost ply in a stack, so positioned, is individually and sequentially separated from the stack, and an edge thereof presented between the jaws of a gripping device. Once the gripping device is satisfied that one and only one fabric ply is in place between the jaws, the single ply is transferred over onto the receiving end of a conveyor for further processing. The fabric separation occurs by means of an aerodynamic technique which tends to lift by suction the uppermost ply from the remainder of the stack. A proximity switch determines the spacing between the gripper jaws which spacing confirms the existence of one and only one fabric ply therein.

Abstract: Disclosed is a unidirectional interdigitated surface wave transducer having at least three discrete arrays of conductive elements, each array comprising, in a comb-like structure, a plurality of electrodes electrically interconnected in parallel and having a periodicity corresponding to one acoustic wavelength of the resonance frequency of the transducer. The discrete arrays of electrodes are deposited upon a piezoelectric substrate in an interleaved pattern to define an interdigitated transducer. Respective electrodes of a given array are substantially equidistantly spaced apart from electrodes of the other arrays and are electrically insulated therefrom. The arrays of electrodes are positioned upon the substrate such that there are at least three electrodes per acoustic wavelength at the resonance frequency.

Abstract: A process for producing high bulk density spheroidal nitroguanidine by fong a solution of from 2 to 9 weight percent of nitroguanidine, 0.5 to 2.0 weight percent of methylcellulose, and 0.5 to 2.0 weight percent of partially hydrolyzed poly(vinyl alcohol) in water at a temperature of from 50.degree. C. to 100.degree. C., and then cooling the solution at a rate of from I to 20.degree. C./minute until the solution temperature is less than 40.degree. C.