Piping and Wiring Diagrams

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These are old drafting designs that are currently being used as wallpaper. From what I could find they all are from about 1942-1947. Though worn, you can still see the different companies that they were contracted with for the designs. These plans show the more practical side of design, where function is put to importance. 

Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram
Piping & Wiring Diagram
Source: Spokane, Wa
Piping & Wiring Diagram