This is a great project. The sealed patterns were one step from production and were loaned out to contractors who used them to prepare their samples. The samples were submitted in turn and also sealed if acceptable. Then the contract run was completed, and for quality control measures random examples of the production run were compared with the sealed samples to make sure they met the standard. In most cases several sealed patterns were held by the respective authority for the branch of service. Sometimes these patterns were not returned to NDHQ.
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Res ipsa loquitur
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