"...The nationwide shortage started after the Postal Service, which had historically manufactured the locks, decided last year to outsource..."
Reference: postal-edaily.blogspot.com
Back in Time | QSO/QSL Card of Roy A. Whistle; 1st LT USAF
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Article Title: QSO/QSL Card of Roy A. Whistle; 1st LT USAF Reference
Source: w5vby.blogspot.com