Abstract: A ball chain including metal balls with a small wall thickness and can withstand a large tensile load are provided. A method of manufacturing the same includes rounding a piece of metal to form rotation-axis symmetric bodies (22) and connecting the rotation-axis symmetric bodies (22) in a chain-like manner with connecting shafts. Each of the connecting shafts has connecting heads on both end portions. Each of the rotation-axis symmetric bodies (22) has a butt seam (24) in a direction of a rotation axis of the rotation-axis symmetric body and a weld part (25) at least one part of the butt seam (24).

Abstract: A ball chain including metal balls with a small wall thickness and can withstand a large tensile load are provided. A method of manufacturing the same includes rounding a piece of metal to form rotation-axis symmetric bodies 22 and connecting the rotation-axis symmetric bodies 22 in a chain-like manner with connecting shafts. Each of the connecting shafts has connecting heads on both end portions. Each of the rotation-axis symmetric bodies 22 has a butt seam 24 in a direction of a rotation axis of the rotation-axis symmetric body and a weld part 25 at at least one part of the butt seam 24.

Abstract: An electric cable is soldered to an electronic circuit board by sticking the heat-resistive adhesive tape on the end portion of the insulating ocating and the end portion of the core conductor of the cable, and melting solder by contacting the heater tip on the heat-resistive adhesive tape. Therefore, the coating of the electric cable is prevented from being peeled off when heated and the heater tip is free from solder dregs.

Abstract: The invention comprises a compact, reliable, and handy electrical connector for connecting two flat cables to a circuit board, by connecting the electrical circuits on the front side of the circuit board to one flat cable and the electrical circuits on the rear side of the circuit board to another flat cable.

Abstract: A submarine cable laying system having an underwater cable laying device towed by a cable laying ship along the sea bottom is disclosed. The underwater cable laying device comprises a cable depressing wheel, a mechanism for elevating and lowering the cable depressing wheel, means detecting passage of repeaters and the like under said cable depressing wheel, and means for detecting the length of a part of the cable having been laid by the cable laying device. The output signals of the two detecting means are sent to a controlling device provided on said cable laying ship, and are so processed that the output signal from the controlling device can control the elevation or lowering of the cable depressing wheel automatically each time the repeaters or the like pass through the cable depressing wheel.