The postal address is

Scientific-Services
Dr. Dietmar Hildebrand                Email: djh@scientific-services.com
Breslauer Strasse 38
35510 Butzbach
Germany

Scientific-Services is not a corporation, but a scientific institution
(classified under German tax laws as "Freiberufliche Tätigkeit", a special category for scientists and artists)
Thus it has no registration number or VAT-id number.