1
Allan I Krauter: Hydraulic muscle pump. Welch Allyn, Wall and Roehrig, October 16, 1990: US04962751 (71 worldwide citation)

This invention comprises four hydraulic muscle pumps connected to four hydraulic dynamic muscles in hermetically sealed pairs to transfer tensive forces from a local to a remote location for use in actuating the articulation section of a borescope or endoscope.


2
Allan I Krauter: Hydraulic muscle pump. Welch Allyn, Wall and Roehrig, May 14, 1991: US05014515 (35 worldwide citation)

This invention comprises four hydraulic muscle pumps connected to four hydraulic dynamic muscles in hermetically sealed pairs to transfer tensive forces from a local to a remote location for use in actuating the articulation section of a borescope or endoscope.


3
Krauter Allan I: Hydraulic muscle pump.. Welch Allyn, December 5, 1990: EP0401129-A1 (1 worldwide citation)

A borescope or endoscope comprising an elongated insertion tube (20), an articulation section (16) at a distal end of said insertion tube, and at least a pair of steering cables (26) for bending the articulation section (16), and incorporating an actuation system for transferring linear motion from ...