Mumm is not a manufacturer. Mumm is a boat design. One of the
companies that
builds Mumms is Beneteau. They also build Trawlers. So, yes, the folks
that
build Mumms also build trawlers. .

Where do you get your information from an old tribal parchment?
Beneteau has never been a builder of MUMM 30s. The only authorized
builders are Carroll Marine, Ovington Boats and dk Yachts. Carroll
Marine was the first and the other two were added later. The class
would never have Beneteau build boats.