I can't scan the 1928 BJPA unfortunately as the spine will break, (I've just tried), however I'll be setting up to shoot some restoration projects later today so will copy the relevant pages then, there's quite a few. Wallace and Heaton and one or two other companies sold the cameras and their adverts often contain additional or different information.

Just checked my 1927 BJPA and there's no refernces to Linhof or Silar.