1950 – Remote-control Manipulator – Art Youmans (American)

Several feet away, the operator controls the arm from this chair. It can measure out liquid by the drop.  "Adelbert"—Science's "Right Arm"—Can Even Write Its Name ALTHOUGH it looks more like a dentist's oversized drill, a gentle-acting mechanical arm called "Adelbert" is actually built like the human arm. It has an elbow, shoulder, wrist and …

1984 – Bellows Robotic Arm/Trunk – James Wilson (American)

  Reference:  Science News – March 26, 1988 The Muscular Machinery of Tentacles, Trunks and Tongues Scientists discover a new way for muscles to work By STEFI WEISBURD An arm without bones could not bend. A person who tried to bend such an arm would instead end up with a short, fat bulge of biceps. …

1997 – Robotic Master-Slave Manipulator – Mark E. Rosheim (American)

Patent number: 5845540 Filing date: Sep 25, 1997 Issue date: Dec 8, 1998 See full patent here. Patent Abstract: A pair of connected joints is provided in a master-slave robotic system each operated by a plurality of force-imparting means. Such force imparting means for the second joint supported on a member controlled by the first …