MAKE A MEME View Large Image ...Dowall single pin escapement - Franklin Institue - DSC06671.JPG Exhibit in the Franklin Institute Philadelphia Pennsylvania USA I took this photograph 2011-10-20 11 52 39 Daderot Escapement collection in the Franklin Institute
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Keywords: 1850 MacDowall single pin escapement - Franklin Institue - DSC06671.JPG Exhibit in the Franklin Institute Philadelphia Pennsylvania USA I took this photograph 2011-10-20 11 52 39 Daderot Escapement collection in the Franklin Institute
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