Misc: what was the surname of the brothers who invented the ballpoint pen in 1938?

Questions

Robert Kennedy (in Brookline, Mass), Democratic Senator from New York, U.S. Attorney General; later assassinated?

Veronica Hamel (in Philadelphia, PA), actor (Hill Street Blues)?

International War Crimes Tribunal opens trial of Nazi leaders in Nuremberg.?

Britain's Princess Elizabeth, marries Duke Philip Mountbatten in London's Westminster Abbey.?

Bo Derek (in Long Beach, CA), actor? (10; Tarzan, Ape Man)?