File:Z35-1968 Sign - Notice - Keep Door Closed at All Times.svg
![File:Z35-1968 Sign - Notice - Keep Door Closed at All Times.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/67/Z35-1968_Sign_-_Notice_-_Keep_Door_Closed_at_All_Times.svg/720px-Z35-1968_Sign_-_Notice_-_Keep_Door_Closed_at_All_Times.svg.png?20230416220718)
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