Wikimedia Commons | Crain's Connecticut
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https://commons.wikimedia.org/wiki/File:Gas_meter_2.jpg
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Photographer: 
Timothy Sweet
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https://commons.wikimedia.org/wiki/User:Tim36272
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Creative Commons Attribution-Share Alike 3.0 Unported
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https://creativecommons.org/licenses/by-sa/3.0/legalcode