Construction worker siluetti 11 months 3 Coal miner siluetti 12 months 0 Businessman in a Hard Hat siluetti 12 months 0 Hard Hat with a Stripe siluetti 12 months 1 Helmet siluetti 12 months 1 Helmet siluetti 12 months 2 Hard Hat siluetti 12 months 0 Construction worker siluetti about 1 year 2 Man and Woman Workers siluetti about 1 year 1 Hard hat siluetti about 1 year 2 Hardhat siluetti about 1 year 3