Poirson trained in Paris with Nicolas Maire, then worked for Vuillaume. After Vuillaume\'s death in 1975 he joined the Gand & Bernadel firm, then established himself independently in 1879. He used a Voirin-iired model. Although his production varies in quality, some good bows exist, particularly from his early career.
Trained in Mirecourt, then employed by the Thibouville Lamy firm. After WWI moved to Paris where he worked independently. His bows tend to follow the style of Emile Ouchard and are of good quality.