6766 - Swiss Association of Horological Jewel Manufacturers

ASFPH - Association suisse des fabricants de pierres d’horlogerie

Contents of the brochure: Presentation of the association founded in 1898. The birth of the horological stone age. Stones: horlogical, industrial and scientific. Sapphire crystal - Sapphire watch-glass. Industrial applications for sapphire and ruby.

21 Seiten