building surveillance systems

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38:33

1:23

13:47

24:55

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13:04

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7:06

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6:33

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10:54

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3:36

7:54

7:01

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2:57

16:29

19:04

7:35

6:31

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00:26

3:10

1:52

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9:40

12:21

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9:23

12:00

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1:48

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14:22