File:Kochs' Gold Medal Hydraulic Barbers' Chair No. 23.jpg
![File:Kochs' Gold Medal Hydraulic Barbers' Chair No. 23.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Kochs%27_Gold_Medal_Hydraulic_Barbers%27_Chair_No._23.jpg/671px-Kochs%27_Gold_Medal_Hydraulic_Barbers%27_Chair_No._23.jpg?20190825222216)
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