20x110 Hispano "cartridge drill M18A1 20mm gun"

Who made this?

I too would like additional information on this drill cartridge, if any is available.

The manufacturer is Excel Foundry and Machine Co., Fall River, Massachusetts.

Regards,

Fede

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Would that also be the same manufacturer of the identical rounds with the same headstamp except marked…

M18A2 and M18A3