translate English to French: The latter three anemometers have separate wind and direction detectors mounted on each side of a "U" arm assembly: 45B anemometer  The 45B anemometer, whose predecessor came into use about 1930, was designed in 1945.
Système de mesure du vent 45B  Cet anémomètre a été conçu en 1945, mais une version antérieure est entrée en service vers 1930.