| The cold industry: cold for relaxation. The relaxation of the gases produces cold while their compression produces heat as when inflating a bike tire. Anonymous illustration from 1925. Private collection.Anonymous Anonymous | 
| € 101.11 
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| Undated                                                                 ·  Engraving
                                                                 ·  Picture ID: 915785 colour · colours · engraving · physical · knowledge · human · transport vehicle · heat · cycling · bicycle · 20 20th 20th xx xxth 20th century · bianchetticor · energy · energy · Private Collection / Bridgeman Images | 
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