'To control the flow of buggies & pedestrians, J.P. Knight invented the first of these in London in 1868 using a lantern'
a traffic signal
INVENTORS & INVENTIONS: To control the flow of buggies & pedestrians, J.P. Knight invented the first of these in London in 1868 using a lantern
To control the flow of buggies & pedestrians, J.P. Knight invented the first of these in London in 1868 using a lantern
To control the flow of buggies & pedestrians, J.P. Knight invented the first of these in London in 1868 using a lantern
INVENTORS & INVENTIONS
a traffic signal
INVENTORS & INVENTIONS