Does anyone know the full names of two engineers associated with the Philips Classical label in the late 1960's–early 1970's, both men worked with producer Vittorio Negri and their last names are Buczynski and Hummeling? Among the recordings this team worked on were the Raymond Leppard, ECO recordings of Haydn symphonies nos. 22, 39 and 47 on Philips 839 796 LY. Appreciate any help you can give. Internet, album image searches turned up nothing.