Abstract: A tube-shaped tubeless tire includes a tire body having two sidewalls and an inner surface, each of the two sidewalls being externally provided along a radially inner edge with an annular recess; a lining belt having two outer edges separately connected to the inner surface of the tire body, making the tire body a closed tube-shaped body; and a wheel rim being provided along two opposite annular outer edges with a laterally inward protruded annular rib each to face toward the annular recess on the sidewalls of the tire body. When pumping air into the tire body, the tire body and the lining belt are gradually expanded to push the annular recesses on the tire body against the annular ribs on the wheel rim, so that the tire body is completely held to the wheel rim.

Abstract: A duplex optical transceiver comprises a connector for optical cable with an optical cable lengthwise disposed therein, a ring-shaped clinging member formed of metal a hollow, cylindrical body formed of plastic, the body including a first opening at an open end coupled to a light source, a second opening on the peripheral surface coupled to a sensor, and a recessed, annular shoulder at the other end, and a filter mirror disposed within the body for deflecting light emitted by the light source to an optical fiber of the optical cable and reflecting light incident onto the optical fiber to the sensor. The clinging member is insertable into the shoulder for fastening by snapping.

Abstract: A process of manufacturing a sleeve for connector of optical fibers comprises shaping a member made of stainless steel into a hollow cylinder, forming at least one portion to be heated on an outer circumferential surface of the cylinder, inserting a cylindrical rod into a bore of the cylinder, melting the portion to be heated by laser, cooling for contracting the bore of the cylinder onto the rod, and removing the cool rod from the cylinder to produce the finished sleeve having a tolerance within 1 ?m. The invention has advantages of a finished sleeve having a tolerance within 1 ?m, no further quality check required, and high production.