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Leird Lumber Co was the company who made the wooden boxes. They were sent to the plant manufacturing the 20mm ammo where they were marked with the description, lot number, and other markings, and loaded. The markings on the crate indicate an inert training round, with inert primer, no powder charge, and an inert solid steel projectile. This cartridge was developed during WW II and I believe continued to be used up through Vietnam.
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