- 7266 - de Vries - May 1960 (est)
- 7267 - van den Broek - May 1960 (est)
- 7268 - Buiter - May 1960 (est)
- 7269 - Koot - May 1960 (est)
- 7270 - Sleurink - May 1960 (est)
- 7275 - Gerrit - May 1960 (est) - Perhaps Gerrit Schulte, pro 1937-1960; RIH/Radium-RIH team 1954/1956/1957/1958/1959
