Abstract: A method and apparatus for manufacturing venetian blinds in which at least two ladder tapes, preferably with rungs each consisting of at least two cross cords, are provided, of a sufficient length for a large number of venetian blinds.The slats are inserted between the cross cords of the ladder tapes to form a substantially continuous mat of slatted ladder tape. The mat is then stored, for example, on a roll or in a container, and is subsequently cut off into individual lengths, each length being suitable for one blind.

Abstract: An apparatus and a method for assembling the slats of a venetian blind in which slats are fed in turn into the venetian blind ladders and are raised to a first position sequentially to form, at that first position, a stack of assembled slats. The length of stroke of the lifting mechanism, preferably a linear motor, is restrained by an abutment which is removed as the last slat of a stack is being lifted, so that the whole stack is then lifted to a higher position at which it is retained and the ladders are moved past the slat feed point so that no slats are inserted therein. The next stack of slats is then formed at the first position and before it is completed, the ladder means are cut between the first and second positions.

Abstract: The invention discloses a prefabricated partition having high acoustical insulation value and comprising two parts which are symmetrical on either side of a plane parallel to and between the outer facings. The frame members of one part being adhered to the frame members of the opposite part by an adhesive over at least a portion of the adjoining frame surfaces. To reduce the area of contact between the rigid frames they may be recessed along a portion of their adjoining surfaces and the recesses filled with an elastic foam. The frames are preferably of a rigid foam material.