Drs. A.D. Steenkamp
Leiden,
Netherlands
Gian Michele & Enrico Maria Pini
Firenze,
FI, Italy
Philip Prins
London (Birr),
Canada
Hilterfingen,
Switzerland
Joe Phillips
New Orleans,
LA, United States
Daniel Thierstein
Bern,
Switzerland
Edwin V. Glaser
Napa,
CA, United States
Ulrich Engel
Stuttgart,
Germany
David G. Waxman
Great Neck,
NY, United States
Francesco Chellini
Firenze,
FI, Italy
Johan Hammarström
Umeå,
Sweden