The scenes at 0:57 and 8:57 may tell something else.  The chalk board on the wall has the RX and TX listed by SN.  At 8:57, the wider view, two men are working on a receiver on the bench.  This could be the shop and that  is the test bench before each TX and RX are hot tested before being  called good enough to be put back in the plane.

Charlie, W4MEC in NC