Abstract: An air-conditioning unit which can be converted from a horizontal air flow configuration to a vertical air flow configuration (or vice-versa) at the installation site without any additional parts or special tools. A reversible drain pan and return (intake) air panel forms part of the air-conditioning unit adjacent to a slant-mounted cooling coil, and may be demounted, reoriented and remounted so as to move the return (intake) air panel from one end of the unit to one side of the unit (or vice-versa). The air-conditioning unit is then tilted 90.degree. so as to position the drain pan under the cooling coil.

Abstract: A current-carrying flexible hose having at least two parallel helical support wires, inner and outer plastic strips wrapped helically about the support wires, and at least one pair of helical electrical conductors disposed on opposite sides of one of the support wires and slidably positioned between the inner and outer plastic strips. Each of the helical electrical conductors comprises a conductive element and a plastic dielectric coating disposed around the conductive element. The plastic dielectric coatings are not bonded to the inner and outer plastic strips so that they may slide therebetween.

Abstract: A bicycle wheel safety insert formed of an annular disk containing a design that imparts dynamic action when placed in a spoked bicycle wheel and rotated thereby attracting the attention of motorists. The insert contains a slit to allow the insertion of the insert within the rim and between the spokes of a wheel. A hole is located on each side of the slit to accept a tie between said holes and a spoke of the wheel. A fluorescent and/or a reflective material, when placed on the insert, provides additional safety protection to the cyclist.

Abstract: A telephone line hold and hold release circuit which, after a central office line which is connected to at least two telephone sets in a telephone terminal system has been seized in response to an incoming call and then placed on HOLD, releases that central office line from the HOLD condition in response to either (i) the re-closing of the hookswitch of the telephone set which seized the central office line, or (ii) the closing of the hookswitch of another telephone set connected to that central office line, or (iii) the release of the central office line by the caller.

Abstract: In a nozzle dam assembly wherein a flange ring is affixed around a circular nozzle opening in a chamber wall, a support frame spans and is in non-threaded connection with the ring by releasable pins which carry under tension any load on the frame directed axially out of the nozzle into the chamber, and a circular dam with a sealing diaphragm disposed over it is attachable to the frame with its rim within the nozzle so that inflatable peripheral sealing means on the diaphragm effect the desired seal of the nozzle independent of the aforementioned axial load.