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From function:
1). It look like something heavy sits on the square box which is solidly attached to the A-frame and wheels and does not move.
2). The long pocket trench with a small back splash is attached to swivels and made to dump backwards.
The base frame has a stop for the pivot arm.
It is highly adjustable to respond to precise weight.
There are no other attachment points. There are no drain holes. No other mechanisms seem to exist.
I would guess a box of heavy fruit is first set on the platform.
Select fruit is placed in the pocket trench.
When there is enough weight, the entire trench assembly swings back and dumps into something else, like a belt or wagon.
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