Выражение встречается в следующем контексте:

The nominal length of movement to the aft to abut the end of the pipeline will be 1.5 [m] to 2.0 [m].
The powered module shall have a system for rolling the pipe forward and backward, with three modes of operation, selectable from the control console :
1. Manual, with continuous speed adjustability
2. Free-wheel
3. Automatic controlled continuous force towards aft, with adjustability.

The range of speed adjustability for various movements shall be as follows:
Side to side : 0 to 0.5 m/sec
Fore and aft : 0 to 0.5 m/sec
Up and down : 0 to 0.2 m/sec
All speeds shall be continuously and infinitely adjustable.

Заранее большое спасибо