High-Security Pin Tumbler Cylinder Patent Print
Patent No. US3499302 · 1970
Invented by Roy Spain (Medeco)
Vintage 1970 patent drawing of the high-security pin tumbler cylinder by Roy Spain (Medeco). Museum-quality archival giclée print.
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About This Print
Vintage 1970 patent drawing of the high-security pin tumbler cylinder by Roy Spain (Medeco). Museum-quality archival giclée print.
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