![](http://www.alamy.com/thumbs/6/39160012-065B-4341-B67C-237DE32CF42D/EW4BPK.jpg)
Gas meter, invariable measure, vintage engraved illustration. Industrial encyclopedia Lami - 1875.
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Photo credit: © Patrick Guenette / Alamy / Afripics
License: Royalty Free
Model Released: None
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