Abstract: Coder-decoder for a transmission channel for digital signals, said signals being constituted by a sequence of bits between a more significant bit formed by a sign bit and a less significant bit.The coder-decoder comprises on the one hand a coder constituted by a circuit able to extract the more significant bit e.g.

Abstract: In a reciprocating pump, notably a metering pump, of the reciprocating type in which the pumping member, diaphragm or piston, is actuated by means of a slide block responsive to a rotating eccentric member, a ball is interposed between an adjustment screw controlling the length of the slide block stroke and the slide block. For this purpose, the ball engages an inclined surface formed in a hollow of the slide block. Preferably, the screw is magnetized and constantly attracts the ball to avoid movements of the ball in relation to the slide block and therefore any premature wear and tear of these members. The inclined surface may have a shape matching that of the ball.