Video showing the Blockwatch periscope surveillance tower in action. Also includes details of the mechanism. For more information please visit http://dbynoe.blogspot.comBlockwatch - periscope surveillance system - YouTube | |
| 12 Likes | 12 Dislikes |
| 16,551 views views | 1,376 followers |
| How-to & Style | Upload TimePublished on 2 Oct 2007 |
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