This is a fascinating bit of Rhode Island history…
An Austrian Count and World War I ace, Antoine Gazda, moved to Rhode Island and lived in the Biltmore Hotel (Providence, RI) for all of World War II, where he was guarded 24 hours a day in secret as he developed an aircraft version of his 20mm cannon. This shell casing at the Varnum Memorial Amory Museum was the first round fired from his prototype.
We’re doing more research to understand the prototype and its level of success.
Gazda 20mm Cannon Prototype Shell 
Gazda 20mm Cannon Prototype Shell 
Antoine Gazda
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