![](http://www.alamy.com/thumbs/6/37AF676E-82EC-4973-B4E5-69CAA2D3918C/2RX2G8E.jpg)
Patent model. Piston rod packing, Hewitt, patent no. 216038. MC*309247.
Size: 2832px × 4256px
Photo credit: © History of America / Alamy / Afripics
License: Licensed
Model Released: No
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