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Sir Francis Ronalds, inventor of an electric telegraph, 1870. Creator: Unknown.
HRM24A49_191

Sir Francis Ronalds, inventor of an electric teleg...

Prototype of a digital heart rhythm monitor developed by Dr. L. Julian Haywood, 1966-1969. Creator: Unknown.
HRM21A73_153

Prototype of a digital heart rhythm monitor develo...

Temporary church, Kentish Town, 1844. Creator: Unknown.
HRM21A06_213

Temporary church, Kentish Town, 1844. Creator: Unk...

The Electric Light Apparatus, 1866. Artist: Unknown
HRM19C51_243

The Electric Light Apparatus, 1866. Artist: Unknow...