I found this exceptional photograph in ebay-fr - no details though the style is reminiscent of NARA photographs of the period - but no such photo is online on NRA ste and the NARA site is notariously (and strangely) poor in documentation on the 1930-1939 period

Exceptional doument sas it shows models of bombs developped in the late 20s and early thirties in the US - without fuzes:
On the Left is a Clarke Aero bomb - designed originally as an anti-submarine bomb
The others are Federal Laboratories bomb models:
The 2ns from the left is the 120lb demolition bomb from 1931 that was superseded by the 100lb model in 1933
The 3rd from the left is the 100lb demolition bomb of 1933
The 4rd from the left is a 30lb Chemical bomb
The 5th from the left is the 25lb demolition bomb of 1931 - a model switfly discontinued as not potent enough (but exproted to Colombia and Brazil and possibly other countries)
The 6th from the left - I cannot identify
The one on the extreme right is another model of Federal laboratories that will be adopted by the USN as the 30lb M5 Frag

Exceptional doument sas it shows models of bombs developped in the late 20s and early thirties in the US - without fuzes:
On the Left is a Clarke Aero bomb - designed originally as an anti-submarine bomb
The others are Federal Laboratories bomb models:
The 2ns from the left is the 120lb demolition bomb from 1931 that was superseded by the 100lb model in 1933
The 3rd from the left is the 100lb demolition bomb of 1933
The 4rd from the left is a 30lb Chemical bomb
The 5th from the left is the 25lb demolition bomb of 1931 - a model switfly discontinued as not potent enough (but exproted to Colombia and Brazil and possibly other countries)
The 6th from the left - I cannot identify
The one on the extreme right is another model of Federal laboratories that will be adopted by the USN as the 30lb M5 Frag
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