Rare Books
The telephone and telephone exchanges : their invention and development
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I1 - Inventions/Developments
Visual Materials
I1 - Inventions/Developments - Walton's patented water heater with a coil to heat cups of water.
photCL SCE 02 - 00269

I1 - Inventions/Developments
Visual Materials
I1 - Inventions/Developments - Walton's patented water heater.
photCL SCE 02 - 00270

I1 - Inventions/Developments
Visual Materials
I1 - Inventions/Developments - Walton's patented water heater, showing the coil for heating a cup of water.
photCL SCE 02 - 00271
