| 摘要 |
A double postcard for concealing confidential information from casual observation comprises a tab closing the edges of the cards opposite the fold line with the outside of one of the cards having the recipient's address and, on the reverse thereof, information to be kept confidential from casual observation with a removable but non-replaceable shield overlying and obscuring the confidential information and removable therefrom for observing such information upon opening the folded cards at the tab.
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