A pair of side by side tractor propelled implement units are connected to a duplex hitch for operation over a broad area and are shiftable to tandem positions with the duplex hitch disposed therebetween for transporting the implement by propelling force of the tractor connected to one of the implement units.

A duplex grounded convenience outlet is provided adapted to receive power blades in twist lock relationship. Simplicity of connector construction and disposition is achieved through use of symmetrical connector strips and feed through mounting bracket with mounting of grounding contacts thereon.

A method is provided for copying in which a duplex copy can be smoothly made. In making N sets of double-sided copies of M one-sided documents, a method of copying includes a first document circulating step of copying images of even ordinal numbered documents on unused sheets and then stores these sheets into an intermediate tray. The second document circulating step of copying images of odd ordinal numbered documents on rear faces of one-side copied sheets forming double-sided copied sheets whi...

In an apparatus and method for producing simplex prints in a single pass duplex printer, two sheets are conveyed in coinciding relationship through a common path during a print cycle. While the sheets are simultaneously conveyed through the common path, a first toner image is formed on one side of one sheet and a second toner image is formed on an opposite side of the other sheet. The toner images are simultaneously fixed on both sheets by a separate fixing station.

An apparatus for photocopying information existing on both sides of a duplex document, using dual scan of a transparent sandwich platen. Duplex copies of the document document to one side of the copy sheet, and then transporting the copy sheet within the apparatus to apply a print of the second side of the document to the reverse side of the copy sheet.

Half-duplex switched carrier operation is emulated in a full-duplex voiceband data transmission system by utilizing predetermined signal indications in each channel to signal the initiation and termination of user data in that channel and thus to control the Receive Line Signal lead extending to the terminals at respective ends of the transmission channel. The signal indication which signals the initiation of transmission is illustratively two scrambled spaces inserted into an idle-state sequenc...

A duplex tray is provided for an automatic duplex copying machine, or the like, for receiving and stacking thereon one-side-copied and for re-feeding those sheets into the machine in order to perform printing on the other side of each sheet, having, a gate for switching the sheet transportation directions from a sheet path for discharging sheets outside the machine to a sheet path for discharging sheets onto the duplex tray, and vice versa; a tray pressure application member means for moving the...

The copying apparatus comprises a document feeder having transport paths for simplex and duplex originals, and at least two copy transport paths for feeding finished copies from the image transfer means to a collection station. One copy transport path is operable to deliver a duplex copy fed therethrough to the collection station with the first printed side facing downwards, and the other copy transport path is operable to deliver a duplex copy to the collection station with the last printed sid...

A system for transmitting actuating and feedback signals between a control center and remote portions of an aircraft on common wires. Actuating signals for an electrohydraulic valve and feedback signals from a linear variable differential transformer monitoring operation of the valve, occur in substantially different frequency ranges and are transmitted simultaneously on the common wires, signal discrimination being accomplished by the use of series connected inductors and capacitors and by reli...

An improved flash fusing apparatus for fusing toner images onto flexible support material. First and second elongated flash lamps are closely spaced and a flexible support web bearing loose toner images on both sides is advanced along a predetermined cylindrical path encircling each of the flash lamps along its longitudinal axis exposing each side of the web to flash radiation from the lamps.