• 

  Official Gazette of the United States Patent Office - United States. Patent Office - Google Books

  https://books.google.de/books?id=0n8bAQAAMAAJ&q=%22Oscar+Gadamer%22&dq=%22Oscar+Gadamer%22&hl=de&sa=X&ved=0ahUKEwjfnrzto43OAhWrJ

  Keine Beschreibung vorhanden.

• 

  Official Gazette of the United States Patent Office: Patents - United States. Patent Office - Google Books

  https://books.google.de/books?id=5FvKA3psdOYC&q=%22Hans+Rudolph+Camenzind%22&dq=%22Hans+Rudolph+Camenzind%22&hl=de&sa=X&ved=0ahU

  Keine Beschreibung vorhanden.

• 

  Official Gazette of the United States Patent Office - Google Books

  https://books.google.de/books?id=iUIY6qLxos4C&q=%22Oscar+Gadamer%22&dq=%22Oscar+Gadamer%22&hl=de&sa=X&ved=0ahUKEwjfnrzto43OAhWrJ

  Keine Beschreibung vorhanden.

• 

  US555426A - Fington - Google Patents

  https://www.google.de/patents/US555426

  Keine Beschreibung vorhanden.

---

---