| 摘要 |
An observation port assembly, arranged to be attached to a door and to permit a panoramic view with a maximum field of view of the area outside the door, including a boxshaped part, attachable to the outside surface of the door, having at least two optical viewing elements with wide angle properties arranged with the viewing oculars adjacent to each other and viewable from the inside of the door, the optical axis of said elements being arranged in a predetermined angle relationship between to adjacently arranged elements.
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