Abstract: A novel bow for playing a violin, including a stick of 12 inches in length, more or less; a string attached to the bow and a ring or the like, suitable for receipt of a musician's finger disposed transversely on the stick so that the musician can play the violin in a variety of attitudes. The stick is selectively adjustable to vary the tension on the string.

Abstract: A dolly to, inter alia, provide load support to a tractor trailer rig in which the dolly may be selectively attached to the tractor or the trailer as a means of engaging a second trailer. A coupling assembly in which the engaging vehicle, whether tractor or trailer, includes a transverse locking bar disposed at an acute angle to the direction of movement, which is selectively coupled to the dolly having a plate disposed at substantially a same acute angle as the transverse locking bar, wherein the plate includes a channel adapted to receive the locking bar, and the dolly having an air bag suspension system engaged with the air system of the tractor, wherein the pumping up of the air bag suspension system secures the locking bar in the channel.

Abstract: An improved delivery system for pumping fluid from a pay zone to the surface of a well consisting of a pump situated near the pay zone of the well, a drive head at the surface of the well and a rod string connecting the two, wherein a transmission is interposed between the pump and drive head on the rod string and fluid pumped from the pay zone passes through conduits, extending longitudinally in isolation through the transmission.

Abstract: A gear set for a transmission for use in limited space and capable of transmitting relatively large amounts of power with a small diameter of the gear sets, comprising a series of helical gear elements having stub shafts extending laterally from either side thereof, each of the stub shafts having teeth formed at the remote ends thereof and a central axial bore extending through each gear element and a coupler adapted to engage the teeth on adjacent gear elements join gear elements in driving contact. The gear set having a relatively large effective diameter, and a tension rail extending through the axial bore in the gear elements with retainers at either end of the tension rail so as to effectively permit limited axial movement along the tension rail while preventing inadvertent disengagement.