The following sites are useful for researching further information about found objects:

Shops / directories

• Tableware / porcelain
  • Marks & Library
  • Porcelain Marks And More
  • PorzellanKompass
  • Identifying porcelain marks, sammler.com
  • Alte Serien
• Glass
  • 20th Century Glass - Glass Encyclopaedia
  • Glasgalerie Jan Kilian
  • Uwe Wolf Alte Gläser
• Postcards
  • akpool.co.uk
  • Ansichtskartenversand
• Technical devices
  • Radiomuseum
• Miscellaneous
  • TeenageWasteland.de (really worth seeing!)
  • Business Studies: Broadcasting and Its History (English)
  • Telecommunications history: broadcasting

Blogs

• Petra on Pottery (ceramics)
• sabines blog (1970s, ceramics)