Musée Helyett, Sully-sur-Loire, France 
The Helyett company was founded in 1919 by two Picard brothers, in Sully-sur-Loire, with another factory near Orleans, and named after the heroine of the operetta Miss Helyett, whose image adorned many of the head badges affixed to Helyett bicycles.
Address: 6 Chem.de la Levée, 45600 Sully-sur-Loire, Francie
Contact: https://www.musee-helyett-sully.fr/en_GB/
Helyett Factory
The unique stamp of the museum in Sully-sur-Loire is given by the fact that the exhibition is located in the original and authentic Helyett production hall.
Book: HELYETT - Dans de Progrés, Toujors et Téte
A look back at the history of Helyett bicycles in Sully-sur-Loire. Almost half a century of industrial adventure to the rhythm of Jacques Anquetil's performances on the Helyett Speciale. 1200 hours of work, 80 photos and illustrations on 176 pages.
More: http://www.helyett.com
