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  1. #71
    Join Date
    Nov 2013
    Location
    Gilbert, AZ 85298
    Posts
    275
    Country: United States

    Default

    The bright circle under the Equitable's builders plate may not be a combination dial...

    Click image for larger version. 

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    there are similar bright circles on the Remote Combination Viewers of these unidentified main and emergency vault doors:

    Click image for larger version. 

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ID:	19214 Click image for larger version. 

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    It looks like the emergency vault door's bright circle has a key hole in it. Could this be a lock to prevent the combination dials from spinning or the to prevent the pressure system hand-wheel from spinning?

    These are the only doors I have found with three combination dials on the RCVs.

  2. #72
    Join Date
    Nov 2013
    Location
    Gilbert, AZ 85298
    Posts
    275
    Country: United States

    Default

    Mystery solved! I think...the 'bright circles' are probably the RCV light switches. I am making this assumption based on the pics I just received of the emergency vault door at the Philadelphia Federal Reserve vault:

    Click image for larger version. 

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ID:	19216 Click image for larger version. 

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ID:	19217

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