Popular Science J-0-5
en
PG-13
7
May 1941
Documentary
Huge electric sign operated by photo cell animation; freshwater fauna propagated by Carolina Biological, sold and used for research; pickup and delivery of airmail in flight with small planes.
Popular Science J-0-5
7
May 1941
Huge electric sign operated by photo cell animation; freshwater fauna propagated by Carolina Biological, sold and used for research; pickup and delivery of airmail in flight with small planes.
