It had a BZE39 or BZ40 fitted on a threaded tin cover which bayonet-fitted the glass collar.
它有一个BZE39或BZ 40线程上的刺刀锡盖，装上玻璃衣领装置。
2
When in use, the U-shaped bayonet is clamped on a bracket of an automobile radiator, and the bolts can fix the whole jig with the mounting holes of the machine cover.