The Nudelman-Rikhter NR-30 was a Soviet cannon widely used in military aircraft of the Soviet Union and Warsaw Pact. It was designed by A.E. Nudelman and A.A. Rikhter, entering service in 1954. The NR-30 was a single-barrel, short recoil operated cannon, essentially an enlarged version of the 23 mm NR-23 weapon introduced in 1949.
Kálmán Bartalis (born May 16, 1889, date of death unknown) was a Hungarian polo player who competed in the 1936 Summer Olympics. Born in Szamosújvár, he was part of the Hungarian polo team, which finished fourth. He played one match in the 1936 tournament.