This company used the letter "X" to market its first product to make use of radial technology.  
A product made by this company in the 1930s called the Metallic used steel cords to support heavier loads than previous models.  This company once sponsored a contest that challenged aviators to make a difficult landing on the Puy de Dome ("pwee de dom") mountain.  It fired inspector Gault Millau for writing a tell-all book in 2003. This company used the letter "X" to market its first product to make use of radial technology.  The nickname for this company's mascot comes from Horace's line, "Nunc est (*) bibendum".  Beginning in 1935, it took over the failing automaker Citroen.  Its brands include Kleber and Uniroyal.  This company's Bib Gourmand recommends certain low-price establishments.  The Allied invasion of France in World War II made use of the Guide Rouge maps published by this company.  For 10 points, name this French tire company which also awards stars to restaurants.
A product made by this company in the 1930s called the Metallic used steel cords to support heavier loads than previous models.  
Michelin [or Michelin Guide; or Compagnie GÃ©nÃ©rale des Ã‰tablissements Michelin] 