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acrylic prints engraving acrylic prints people acrylic prints dining room acrylic prints technology acrylic prints physics acrylic prints kitchen acrylic prints waiter acrylic prints color image acrylic prints dining acrylic prints cooking acrylic prints vertical acrylic prints food acrylic prints eating acrylic prints food and drink industry acrylic prints archival acrylic prints

drawings engraving drawings people drawings dining room drawings technology drawings physics drawings kitchen drawings waiter drawings color image drawings dining drawings cooking drawings vertical drawings food drawings eating drawings food and drink industry drawings archival drawings

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Communication by speaking tube, c1850. A waiter serving clients in a restaurant, speaking to chefs at work in the kitchen on the floor below, using a speaking tube. Before the invention of the telephone this device was used for communication between different levels in houses, warehouses and ships. Educational print published in Wurtemberg, Germany c1850. (Photo by Oxford Science Archive/Print Collector/Getty Images)

Image provided by Getty Images.