Abstract: A coated steel sheet having excellent corrosion resistance comprises: a zinc or a zinc alloy plated steel sheet or an aluminum or an aluminum alloy plated steel sheet; a composite oxide coating formed on the surface of the plated steel sheet; and an organic coating formed on the composite oxide coating. The composite oxide coating contains a fine particle oxide and a phosphoric acid and/or a phosphoric acid compound. The organic coating has thickness of from 0.1 to 5 &mgr;m.

Abstract: Steel sheet having organic coating comprises: a zinc or a zinc alloy plated steel sheet or an aluminum or an aluminum alloy plated steel sheet; a composite oxide coating formed on the surface of the plated steel sheet and containing at least one metal selected from the group consisting of Mn and Al; and an organic coating formed on the composite oxide coating and containing a rust-preventive additive component.

Abstract: A surface-treated steel sheet includes a steel sheet, an Al—Zn-base alloy plating layer formed on the steel sheet, a chemical conversion film provided on the alloy plating layer, and a concentric layer of a Cr compound that is formed on the alloy plating layer of the chemical conversion film. The surface-treated steel sheet may include a steel sheet, an zinc-base plating layer formed on the steel sheet, and a film that contains chromium and calcium and that is formed on the zinc-base plating layer.

Abstract: Disclosed is an optical fiber-housing metal pipe, comprising a base body of an optical fiber-housing metal pipe, an aluminum layer formed on the surface of the base body, and an oxide layer formed on the aluminum layer, the oxide layer serving to improve the corrosion resistance and wear resistance of the optical fiber-housing metal pipe. Also disclosed is an optical fiber-housing metal pipe comprising a base body of an optical fiber-housing metal pipe, an Al-X alloy layer formed on the surface of the base body, where X is one or two kinds of elements selected from the group consisting of Mn, Ti, Ni, Cr, Nb, Mg, Fe, In and Sn, or an Al-based composite layer containing at least one kind of a material selected from the group consisting of a carbide, an oxide and an organic compound.

Abstract: A virtual LAN system forms a virtual group which is based on elements having physical attribute or logical attribute and constituting a virtual LAN, sets a client address and priority of the virtual group in a virtual group registration table, and allocates unicast and broadcast traffic bands in group units.

Abstract: An automatic ID assigning device for LAN instruments connected in a network assigns ID numbers from a master LAN instrument to respective slave LAN instruments connecting sequentially to the master LAN instrument. A first slave LAN instrument stores, as its own self ID, an ID number supplied in an ID assignment command signal supplied from the master LAN instruments through a data line connecting ports of respective slave LAN instruments. The slave LAN instrument returns an ID assignment acknowledging signal to the master LAN instrument and connects upper and lower ports of the slave LAN instrument together. The master LAN instrument updates a connecting number table of the ports of the slave IDs upon receipt of the assignment acknowledging signals and transmits a subsequent ID assigning command signal to another slave LAN instrument through the data line and through the connected ports of slave LAN instruments to which ID numbers have already been assigned. The upper and lower ports, i.e.

Abstract: An anchor for hooking and cutting a submarine cable comprises an anchor body part, a cable-hooking part and a connecting part, these parts being connected together into a form like a fishing hook. A cable-sensing device is provided on the inner side of the connecting part and spring-biased in the floating-up direction. A cutting device is provided for cutting and holding the submarine cable by being advanced from the anchor body part by hydraulic pressure making use of a force such as sea water pressure or a tugging force for raising the submarine cable externally applied to the anchor body part when the cable-sensing device is caused to sink against the biasing force in the floating-up direction by receiving the tension in the cable hooked on the inner side of the connecting part.

Abstract: A cable detector has a plurality of rotatably series connected hooks having an opening mouth for accepting a cable on sea bottom with an equal angular intervals, a contact pressure sensing means for indicating that a cable is engaged with one of said hooks by measuring contact pressure on one of the hooks, and an electrical switch which is actuated by said contact pressure sensing means to provide an electrical signal when a cable is detected.