Assertion: engine | /r/AtLocation | continual operation
Facets:
value: for upwards of two years
type: TEMPORAL
Source sentences:
text: When this engine had been in continual operation for upwards of two years, it had not only performed the work of the foundry in the most satisfactory manner, but had been tested (by a friction brake on a third mover) to the extent of lifting nearly 687 tonnes (1,500,000 pounds), a power of approximately 34 kilowatts (45 horsepower).[citation needed]