Article D712-11-2 of the French Commercial code
The purchaser of all or part of the business of a chamber of commerce and industry shall simultaneously inform each public-sector employee concerned and the chamber of commerce and industry that employs them of its proposal for a private-law contract or public-sector employment contract as provided for in article L. 712-11-1 by registered letter with acknowledgement of receipt. Within a maximum period of one month from the date of notification…