Signedon front of package: Bendix Friez CHARTS FOR RECORDING INSTRUMENTS / MAKERS OF THE FINEST WEATHER INSTRUMENTS SINCE 1876 / FRIEZ INSTRUMENT DIVISION / BENDIX AVIATION CORPORATION / BALTIMORE 4 MD
Inscribedon the end of the package: 58-B / 502761
FunctionCharts for recording data from hydrograph instrument, which registers relative humidity.