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- London Underground map 1908
- F.H. Stingemore c. 1931 © London Transport Museum
- Early sketch of Harry Beck's design c. 1931 © London Transport Museum
- Harry Beck 1933 © London Transport Museum
- Sydney Metro map 1939 © London Transport Museum
- Harold F. Hutchison 1960 © London Transport Museum
- Paul Garbutt 1964 © London Transport Museum
- Paul Garbutt 1970 © London Transport Museum
- London Underground map 2012 © London Transport Museum
- Harry Beck with his diagram © Ken Garland, courtesy of London Transport Museum
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