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Hi,
the T-7 was used in incendiary, illumination, shrapnel and agitation (leaflet distribution-propaganda) projectiles of the 122mm and 152mm ammunition.
Since certain year the impact feature was omitted. I think it was 1973.
You can see no UD (impact) marking on the setting ring.
The T-7 umg, was manufactured in East Germany from the Russian T-7. The impact feature was not used but the main difference is the added weight to insure the ignition of the powder train with the lower launch impulse of the rocket. From outside it is recognizable by red top of the fuze (and cap) and the safety pin holding the weight.
It was possible (but forbidden) to set the fuze for impact, the upper ring train was initiated but not the lower thus giving a malfunction. When the impact feature was disabled on the original T-7 the UD did not appear on the T-7umg.
Regards, Bob
There is an original Russian document, which states, that the T-7 fuzes, manufactured before 1964, were issued as powder train time and impact fuzes, and all T-7 fuzes, manufactured after 1964, are powder train time fuzes only!
Mrfuze, USA
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