read somewhere that Richard Schüler was a close friend of Richard Marholdt

Peterlongo advertisement with Schüler rifle in 11,2x60

another Schüler made 11,2x72 for Peterlongo/ Marholdt
http://www.littlegun.info/arme%20autrichienne/ancien%20artisan/a%20peterlongo%20gb.htm

the Triumphal Arch in Innsbruck before WW1 you see on the wall right side "Tiroler Waffenfabrik Johann Peterlongo"

same view today

https://en.wikipedia.org/wiki/Triumphal_Arch,_Innsbruck

view of the building 1910 and the peterlongo work shop, says 1939 but looks more 1920s to me

bomb hit, WW 2

the building in 1951

"Peterlongo Arms Factory and Peterlongo Sports House
In 1857, Johann Peterlongo founded the "Waffenfabrik Peterlongo" in the Maria-Theresien-Strasse 57. In addition to weapons and ammunition he also traded with equipment for hunters and shooters. Around 1938, the former employee Marholdt became Co-owner and later took over the company, gave them the name "Arms Factory Peterlongo and Marholdt". Later Marholdt built a new building on a back lot and the business moved from the Maria-Theresien-Strasse to the Landhausplatz.
Source: eyewitness reports and Innsbruck city archives

Was produced in the backyard in Stöcklgebäude. "It was a long thin building in the backyard, that was the old Peterlongo Workshop. In parallel behind, there was the shooting range, 30 m long, I can remember it well. The new workshop of the Marholdts was then in the next courtyard behind, at the Bacchus cellar. We are in my teaching again and again in the old workshop for functional shooting. "
Mr. S., former apprentice at Marholdt "
http://www.verortete-geschichten.net/wp-content/uploads/2015/10/04_tafel_druck.pdf