industry 4 home

#Two quadrilaterals, one inside the other #Quadrilaterals with dark surfaces or parts of surfaces #Quadrilaterals containing one or more letters #Quadrilaterals containing one or more numerals #Quadrilaterals containing other figurative elements #Numerals juxtaposed or joined to a letter or a figurative element #Numerals presenting a special form of writing #Letters in light-coloured characters on a dark background #Series of letters separated from one another other than by a single space #Letters presenting a special form of writing #White, grey, silver #Blue #Urban houses, skyscrapers #Cog wheels, wheel cogs #Wheels or bearings with inscription