• On the 26th of March 1885 the first Bulgarian technical
association was instituted in the town of Russe.
• On the 2nd of February 1893 the Bulgarian Engineering -Architectural
Association /BIAD/ was instituted in the city of Sofia as
in 1937 it was reorganized into Union of the Bulgarian Engineers
and Architects /SBIA/.
• On the 27th of March 1949 the Union of the Bulgarian Engineers
and Architects and six other technical organizations were
incorporated into scientific- technical unions.
• In 1965 two independent organization were differentiated
- Scientific -Technical Unions /NTS/ and the Union of the
Architects in Bulgaria /SAB/.
• On the 2nd of March 1989 NTS was given a new name - Federation
of the Scientific -Technical Associations in Bulgaria /FNTD/.
• On the 22nd of March 1990 the Board of Managers announced
26th of March for official holiday of the organization that
should be celebrated as "The Day of Gratitude" to
the veterans and organization's history.
• On the 30th of May 1992 at the IXth special congress FNTD
was given a new name - Federation of the Scientific -Technical
Unions in Bulgaria /FNTS/.