Abstract: An articulated tube structure to be arranged next to the head of a fiberoptic endoscope to permit same to be tilted in either of four different directions by manipulation of pull wires. The tube structure comprises a series of relatively short elementary tubes each having two pairs of lugs on its opposite ends which are angularly displaced 90.degree. from each other. These elementary tubes are jointed in spaced end-to-end relationship by wire support members passing through their overlapped lugs. The wire support members have holes in their ends located inside the tube structure, and the pull wires extend through the holes with clearance. A recessed inner tube can be nested in each elementary tube to eliminate unevenness of the internal surfaces of the tube structure.

Abstract: In a rolling mill, a rotatable laying pipe having at least one curved tubular pipe section with entry and exit ends. Replaceable tubular liner members are arranged in end-to-end relationship in each pipe section. Retainers are provided at the entry and exit ends of the pipe sections for retaining the liners in place during operation of the laying head.

Abstract: According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod with a floating core of tube sections constructed the same positioned end to end but not attached through the hollow center of the coil of wire rod to keep the coil of wire rod from collapsing under torsion loads required for a drilling operation. A thin wall hose is laid through the tube sections so drilling fluids can be pumped through the flexible drill pipe during a drilling operation.