Date
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Small Auxilliary (Generator) Props
Late teens to early twenties
Prop #1 - $260
No manufacturer. Faded stamping on front of one blade reads "Danger - Fan Blade is Unsafe" and other reads "Signal Corps U.S. Army"
Remaining information is too difficult to read.
See this link for similar props and additional information.
Prop #2 - $300
UNICO ("Unit Construction Company, Philadelphia"). Decals on rear of blade. See full sized UNICO propeller. This small propeller was identical to these on a DH4.
Prop #3 - $200
No manufacturer or decals. Rear of prop stamped "15 inch Diameter" and "2-10 Pitch".
See this link for more information.