The dukes of Burgundy seem to have made a major technological shift in the 1440s. According to the records below, from 1362 to 1445 in cases where the material of the bow was identified they owned or bought 552 crossbows with wooden bows, and 195 composite bows of corne. From 1446, when they first began to acquire steel crossbows, to 1485, they owned or bought 197 crossbows with wooden bows, and 1,422 with steel bows.
Garnier, Joseph. 1895. L'artillerie des ducs de Bourgogne: d'après les documents conservés aux archives de la Côte-d'Or. Paris: H. Champion.