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  2. Speidel - Wikipedia

    en.wikipedia.org/wiki/Speidel

    With an initial investment equivalent to US$10, Speidel started making gold and silver chains with his wife, in the basement of his home in Pforzheim, Germany. He has been credited with developing the gold-over-metal method of manufacturing called " bi-metal " (also incorrectly known as gold "plating" ) which proved successful. [ 2 ]

  3. Gold-filled jewelry - Wikipedia

    en.wikipedia.org/wiki/Gold-filled_jewelry

    This abbreviation is incompatible with FTC guidelines, which require clear labeling of the gold content and fineness (e.g., 1/20 14K GF). [3] Most high quality gold-filled pieces have the same appearance as high carat gold, and gold-filled items, even with daily wear, can last 10 to 30 years though the layer of gold will eventually wear off ...

  4. Bezel (jewellery) - Wikipedia

    en.wikipedia.org/wiki/Bezel_(jewellery)

    Signet ring with engraved bezel Ring with an engraved gem in a bezel setting. A bezel is a wider and usually thicker section of the hoop of a ring, which may contain a gem or a flat surface (usually with an engraved design, as in a signet ring). [1] Rings are normally worn to display bezels on the upper or outer side of the finger.

  5. Mauser BK-27 - Wikipedia

    en.wikipedia.org/wiki/Mauser_BK-27

    The BK 27 (also BK27 or BK-27) (German abbreviation for Bordkanone, "on-board cannon") is a 27 mm (1.063 in) caliber revolver cannon manufactured by Mauser (now part of Rheinmetall) of Germany. It was developed in the late 1960s for the MRCA (Multi Role Combat Aircraft) program that ultimately became the Panavia Tornado .

  6. List of thermal conductivities - Wikipedia

    en.wikipedia.org/wiki/List_of_thermal_conductivities

    30 varnished silicon steel foils each of thickness 0.014 inches (0.356 mm): density 7.36 g cm −3; measured near a temperature of 358.2 K under pressure in the range 0 — 132 psi: 0 psi 0.512 w m −1 K −1 20 psi 0.748 40 psi 0.846 60 psi 0.906 80 psi 0.925 100 psi 0.965 120 psi 0.992 132 psi 1.02 120 psi 1.00 100 psi NA* 80 psi 0.984 60 ...

  7. German mark (1871) - Wikipedia

    en.wikipedia.org/wiki/German_mark_(1871)

    3 mark, 16.6667 g (15 g silver), from 1908 onwards; 5 mark, 27.7778 g (25 g silver) These silver coins are token or subsidiary currency for the gold mark and are therefore legal tender only up to 20 marks. However, all silver 3-mark Vereinsthaler s issued before 1871 enjoyed unlimited legal tender status even after the switch-over to the gold ...

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