Claim: Mason Pearson, who was called by a Yorkshireman in the mid 1860s to come to work at the British Steam Brush Works, in the East End of London (the historic core of wider East London, east of the Roman and medieval walls of the City of London and north of the River Thames), invented the "pneumatic" rubber-cushion hairbrush.
Evidence: In the mid 1860s a Yorkshireman called Mason Pearson came to work at the British Steam Brush Works, in the East End of London.