The best known airguns (post WWII) with the DST are the Walther's and the rarer Weihrauch's.
All of these triggers where available in firearms before WWII and there where many left over after the war.
These DST triggers are independent units separate from the actual "sear unit" ,so it was relatively simpel to adapt a standard trigger and make it suitable for the DST.
There are some small differences between models used.
Weihrauch:
Walther:
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Frank