Abstract: A two-way envelope especially designed for use by Public Utilities, credit companies, mail order retailers and similar companies which have to send statements, bills, advertising brochures and/or offers and want to receive back payments or orders from their clients or consommers by return of mail. The envelope is made of one piece and comprises a flat pocket for receiving at least one document to be mailed or mailed back, and a flap integrally extending the upper edge of the top surface of this pocket. This flap comprises a first portion identical in size to the bottom surface of the pocket, and a second portion smaller in size than the top surface of the pocket. A first folding line is provided onto the flap adjacent the pocket to allow this flap to be folded upon the pocket to close with the first portion of the flap extending flat on the bottom surface of the pocket.

Abstract: A device for fixing the wish-bone of a sail-board to the mast of this sail-board in a fast and easy manner. The device comprises a U-shaped element intended to be connected to the mast, this element having two sleeve-shaped ends in which are inserted both arms of the wish-bone. A column-shaped, mast-engaging body is provided to connect the U-shaped element to the mast. This body has a bearing surface against which the mast may engage. A lever-operated, hook-clamping system is mounted on both sides of the bearing surface of the body to fix this body to the mast after the mast has been positioned against the bearing surface, such a fixation providing the requested connecting of the U-shaped element and wish-bone attached thereto to the mast. This device is particularly interesting in that it considerably simplifies the relatively delicate installation of the wish-bone onto the mast of a sail-board.

Abstract: A method and a device for controlling a silo unloader of the type comprising a first electrical motor for driving a gathering apparatus located on the top of the bulk material and a second electrical motor operating a winch to which is suspended the gathering apparatus for lifting, holding in position at the same level or lowering this gathering apparatus into the silo. The method comprises the steps of measuring the current supplied to the first motor and controlling the second motor for lifting, holding in position at the same level or lowering the gathering apparatus in accordance with the measured value of the current. The control device comprises a current detector and an accurate rectifying amplifier for generating a measure signal in relation with the current supplied to the first motor.