1939 in the United States
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19th century · 20th century · 21st century |
| Decades: |
1900s 1910s 1920s 1930s 1940s 1950s 1960s |
| Years: |
1936 1937 1938 1939 1940 1941 1942 |
Contents |
[edit] Events
- Russian-American physicist Vladimir Kosma Zworykin directs a group to produce the electron microscope.
