Joseph Wilson Swan and Sir James Dewar [full inscription unknown]

This plaque is mentioned in http://www.walklondon.org.uk/uploads/File/leaflets/lvws2directions_15062010214941.pdf

East Duck Lees Lane, Enfield, London
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Colour: blue

Wikimedia:

Flickr:

See also...
Spudgun67 on Wikimedia Commons
HJGrey on Flickr
newcastleplaques on Flickr
newcastleplaques on Flickr