. . . . . . . "47792758"^^ . . "John Whitehead Greaves"@en . . . . . . . . . . . . "1085932324"^^ . . . . "John Whitehead Greaves (21 June 1807 \u2013 12 February 1880) was an English businessman who was instrumental in developing the slate industry in Wales."@en . . . . . . . . . . . "3439"^^ . . . . . . . . . . . . . . . . . . . . "John Whitehead Greaves (21 June 1807 \u2013 12 February 1880) was an English businessman who was instrumental in developing the slate industry in Wales."@en . .