Never seen before and a search brings up mostly references to airplane design, but it looks like it could be a design I saw mentioned recently by one of the modern Italian makers. Don't remember which but the function was to fire either one or both barrels. Pulling one trigger fired one, pulling the other fired both. By pulling them in a front/back sequence they fired in a normal one two sequence. By pulling the back first, both were fired. In the case of the modern gun, it is specifically made for crossing shots in that the barrel is regulated to diverge. In looking at the Lang I suspect it is of a similar intent with normal sears but the front trigger trips both. I am baseing this on the shape of the two triggers. Pulling the rear trigger would release only one sear; pulling the front would fire both due to the close physical position of the front trigger to the rear (a double by design). Interesting concept by design, but the variable pull weight of of the triggers, the drastic difference of position and the likely knuckle busting of that trigger guard would be really hard to live with. Bet it hasn't been shot a lot.
This theory would be consistent with a lot I read when a kid in the 50's. Most authors and editors reported that the common practice in Britian with doubles in the earlier years was to pull the rear trigger first, then the front. This was supposedly due to being faster to switch triggers forward while under recoil, and was also a reason for articulated front triggers, in addition to finger protection. This method was reportedly due to almost all shooting being driven shooting. The trigger on the Lang, if this is correct, makes it an easy way to address that situation and still allow separate shots.
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