The story
B.N.C. was established by Lucien Bollack (an engineer who had also worked for Hispano-Suiza) and his financier, banker René Netter, in January 1923. The technical director was Jacques Muller, also known as "Jack". Muller's earlier J.M.K. cyclecar formed the basis of their first car the "DZ".
B.N.C. were a successful maker of cyclecars, winning many rallies albeit not selling very many cars. In the late 1920s, the company tried to penetrate a higher market sector – unfortunately the demand for large passenger cars and for ultra-light racing cars were both low, and Bollack and Netter were forced out of their company in 1928 when the business was acquired by Charles de Ricou, an energetic businessman who by now had a reputation for rescuing financially troubled automobile manufacturing businesses. In the case of B.N.C. his timing was less than perfect, however, in that (like many others) he failed to anticipate the Great Depression, B.N.C. launching the large 8-cylinder engined "Aigle" in October 1929, a few days before the stock market crashes gave notice of a decade of severe contraction and stagnation for the French economy.
Shortly after he had taken over at B.N.C., de Ricou took over two other companies in financial difficulty, Lombard and Rolland-Pilain; Charles de Ricou took a double stand, directly opposite one of the principal entrances of the Grand Palais, at the 25th Paris Motor Show in October 1931, and displayed on it cars from all three of his companies, B.N.C., Lombard and Rolland-Pilain. Models on display included the new B.N.C. 6-cylinder engined 2-litre B.N.C coupé "Vedette ADER". In the event this car was never produced for sale, however.
For 1931 a line of sporty front-wheel drive B.N.C. cars with pneumatic suspension were presented but came to naught. The doors of the firm were shuttered shortly afterwards.
One of B.N.C.'s drivers, André Siréjols, had already been building special bodies for B.N.C. cars. He took over the remaining stock of parts and kept on assembling a trickle of cars into the fifties, usually referred to as "B.N.C. Siréjols". The last of these continuation cars were equipped with Ford's "10 HP" 1172 cc side valve four.
From Wikipedia’s article on Bollack Netter and Co, shared under CC BY-SA 4.0.4