The M63 "Staaldak" replaced a steel combat helmet designed and patented in what year?
M63 helmet: The M63 (nicknamed "Staaldak" in Afrikaans) is a combat helmet of South African origin. M63 helmet:  Based on the French Modèle 1951 helmet, the M63 replaced the British type Brodie helmets during the early 1960s, and saw extensive use during the Rhodesian and Angolan bush wars. Brodie helmet: The Brodie helmet is a steel combat helmet designed and patented in London in 1915 by John Leopold Brodie.
1915