Abstract: Method for manufacturing knockdown board material, including steps of: using a conveying device to convey a board material and immerge the board material into a resin tank to which a fireproof agent is added, after the resin fully infiltrates into the board material, the board material being compressed by rubber rollers and then dried and solidified to form a protective film; attaching printed paper to the surface of the board material by way of adhesion or thermal transfer-printing stripes on the surface of the board material; painting a layer of surface treatment agent on the surface of the board material by way of rolling or spraying; laying EVA foam material on back face of the board material and embossing stripes on the foam material; and cutting the board material into a certain shape.

Abstract: A telephone system including circuitry for monitoring the "on hook" and "off hook" conditions of telephone handsets coupled to a system controller and disconnecting all off hook handsets from the telephone line. With the detection of an alarm condition at a security alarm system that requires a communication link, line seizure is effected via an SCR controlled seizure circuit serially connected between each distributed handset and the telephone line. The seizure circuit normally conducts when a connected telephone is off hook. Upon detecting an alarm, a line monitor momentarily shorts the telephone line to drive any conducting line seizure circuits into a non-conducting condition that is maintained sufficiently long to permit the system controller to gain control of the line. During controller communications, the handsets are also isolated from the telephone line. A local phone is also coupled to permit reprogramming if an inoperative line is detected.

Abstract: A modular construction unit includes: a pair of supporting columns, each having a U-shaped open trough vertically formed in one side; a plurality of scarfing blocks, each having at least one scarfing slot formed in one side, provided in conjunction with the U-shaped open trough for being detachably inserted therein; a plurality of junction blocks which are formed similarly to the scarfing blocks, each having a plurality of threaded holes and scarfing slots provided in one side for being movably inserted in the U-shaped open trough along with the scarfing blocks; a plurality of scarfing members and intermediate beams respectively provided in conjunction with the scarfing slots and the threaded holes of the scarfing blocks and junction blocks for being respectively connected therewith between the supporting columns; so that, with different scarfing blocks and scarfing members, various patterns of assembly for partioned screens and door plates can be made without changing the supporting columns.