Maybe you can help me. I got a stack of old devices (switches, receptacles,...), and out of pure curiosity I'd like to identify the manufacturer. Only thing I know is the company logo, an uppercase M in a perpendicular triangle. These guys have obviously been around for a very long time (50ies or earlier, well into the 80ies) and almost had a monopoly on devices in Austria. When going into an old house here that hasn't been recently rewired you can be almost sure you'll find stuff made by that company. All parts carried a 3digit part number (for example a 3-way toggle was P121). do you have any idea? Do they still exist? The stuff was really reliable.
Paul, you hit the nail on the head. I just got a reply in de.sci.ing.elektrotechnik. The company was Maté, founded 1918 in Vienna. 1972 it merged with PE (Presswerk Erlacher) to MPE, which in 1976 became part of... LeGrand!