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Handwritten sign on a speaker
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"Please do not disconnect. Speaker is part of fire system. Thank you."
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Kittatinny Mountain Tunnel [09]
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Kittatinny Mountain Tunnel [10]
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Kittatinny Mountain Tunnel [11]
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Kittatinny Mountain Tunnel [12]
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Kittatinny Mountain Tunnel [13]
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Kittatinny Mountain Tunnel [14]
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40th Street trolley portal