Répertoire des Numéros de brevets avec leur indices de classement : Bibliothèque des inventions horlogères, années 1888-1947. Index 1 / Robert Berthoud.

Contributor(s): Material type: TextTextPublisher: [Place of publication not identified] : [publisher not identified], [1950?]Description: 124 pages ; 30 cmContent type:
  • text
Media type:
  • unmediated
Carrier type:
  • volume
Subject(s):

31560000076980 10147

Index of horological Swiss patent numbers 1888 to 1947 crossreferenced to the Berthoud classification system of horological innovations

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