Blazon: Argent on a pale vert between two flanks gules, the dexter charged with five trefoils in pale and the sinister with a chain in pale, a triple mount in base and a stone hut of the field
Donnersbachwald technically no longer exists, as it was incorporated into the municipality of Irdning-Donnersbachtal in 2015. I’d assume that the mount refers to the local geography, which is extremely common for municipal arms. The vert and argent tinctures may be a reference to the Styrian arms, but that’s only speculation. Unfortunately, I’ve got nothing on the stone hut (or Kuppelbau, as the German blazon has it). My guess is that it’s a distinctive archeological construction in the region, which is also a pretty common motif for cities and towns, but I can’t find any mention of something like that. And if you’re wondering why I’ve called the charges on the sides “flanks,” see here. TL;DR it’s a charge specific to German heraldry, and they’re not the same things as flaunches.
Blazon: Per fess argent a trefoil issuant from the partition line vert and sable a lock plate or
The trefoil is a reference to the nearby monastery of Gleink, which used gules a trefoil vert as their arms. The lock plate allegedly comes from the arms of the Stadler family, though I cannot confirm this.
Blazon: Gules on a chevron or three estoiles sable, on a chief argent as many trefoils slipped vert
Crest: On a wreath gules and or an eagle wings displayed and elevated and head downwards and to the sinister proper holding in the beak an ear of wheat stalked and leaved or
Mantling: Gules lined or
The arms in the primary part of the shield belong to the Carre family, who founded the local almshouse and grammar school, while the trefoils are from the arms of the Harveys. The eagle represents the town’s associations with the Royal Air Force, while the wheat represents local agriculture.
Blazon: Per fess argent a four-spoked cogwheel sable (from the former arms of Mühlhausen) and per pale azure a bunch of grapes slipped and leaved argent (from the arms of Tairnbach) and or a trefoil vert (from Rettigheim)