1) Causal agency 2) Causal agent 3) Cause 4) Operator 1) Driver 2) Hoister 3) Motorman 4) Switchman 5) Tax base 6) Telegrapher 7) Telegraphist 8) Telephonist 9) Twiddler 10) User 
In robotics a manipulator is a device used to manipulate materials without direct contact. The applications were originally for dealing with radioactive or biohazardous materials, using robotic arms, or they were used in inaccessible places. In more recent developments they have been used in applications such as robotically-assisted surgery and in...
• (n.) One who manipulates.
Ma·nip'u·la`tor noun One who manipulates. 
A stationary (does not mean that nothing moves) movement assist device that is often equipped with end effectors for handling different types of loads. End effectors include all forms of grippers, forks, barrel grabs, etc. Manipulators counteract the weight of the load, rendering it almost weightless by way of hydraulic or pneumatic cylinders, or s...
[n] - a person who handles things manually