question: One of the most prestigious watch manufacturers founded by a French horologist is located where? 
answer: Geneva, Switzerland
context: Title: Hong Kong Watch &amp; Clock Fair
  Passage: The Hong Kong Watch & Clock Fair is a timepiece trade show held annually in Hong Kong.  It is organised by the Hong Kong Trade Development Council (HKTDC), Hong Kong Watch Manufacturers Association Ltd., and The Federation of Hong Kong Watch Trades and Industries Ltd.  The fair showcases both Hong Kong and international labels, and also serves a platform for participants to exchange information and market intelligence.The five-day-long trade fair is opened every year in the beginning of September at the Hong Kong Convention and Exhibition Centre.
  Title: Patek Philippe &amp; Co.
  Passage: Patek Philippe & Co. is a Swiss watch manufacturer founded in 1851, located in Geneva and the Vallée de Joux.  It designs and manufactures timepieces and movements, including some of the most complicated mechanical watches.  It is considered by many experts and aficionados to be one of the most prestigious watch manufacturers.
  Title: Adrien Philippe
  Passage: Jean Adrien Philippe (16 April 1815, La Bazoche-Gouet, Eure-et-Loir – 5 January 1894) was French horologist and cofounder of watchmaker Patek Philippe & Co. of Geneva, Switzerland.
  Title: Manistee Watch Company
  Passage: The Manistee Watch Company made low quality watch mechanisms that were put into cases by other companies.  The watches were in 16 and 18 size.  The company name was emblazoned on the back plate of most 18 size movements.  Some 16 size movements were jeweled.  The dials, jewels, and hairsprings for the mechanisms were purchased from European watch manufacturers, but all other parts aside from the outside case were produced at the Manistee Watch factory.  Most of the jewels for the watches were from heliotrope garnet and manufactured specifically to the correct dimensions for the Manistee watches in Switzerland.  The first watches made sold for five dollars each.
  Title: List of German watch manufacturers
  Passage: This is a list of watch manufacturers based in Germany.  Note that manufacturers that are named after the founder are sorted by surname
  Title: Zenith (watchmaker)
  Passage: Zenith SA is a Swiss luxury watchmaker.  The company was started in 1865 by Georges Favre-Jacot at the age of 22, in Le Locle in the canton of Neuchâtel.  Zenith was purchased by LVMH in November 1999, becoming one of several brands in its watch and jewellery division.  Jean-Claude Biver became Interim CEO in 2017, replacing CEO Aldo Magada, who had replaced Jean-Frédéric Dufour in 2014.  Zenith is one of the Swiss watch manufacturers that still produce their own movements in-house.  The "El Primero" calibre, which was first released in 1969 and is still produced today, was one of the first automatic chronograph movements and has a frequency of 36,000 alternations per hour (5 Hz).  This high rate allows a resolution of ⁄ of a second and a potential for greater positional accuracy over the more common standard frequency of 28,800 alternations per hour (4 Hz).  The El Primero was honoured with a 2012 release of the El Primero Stratos Flyback Striking 10th, limited to 1,969 pieces (in honour of the original 1969 release date), that housed the same 36,000 vph movement and a sub-dial measuring in tenths of a second to make a complete rotation every ten seconds.
citations: Patek Philippe &amp; Co. Adrien Philippe