Cement Mixer and Flatbed

Cement was invented during the Roman Empire and was considered to be a military secret. When the empire collapsed, so did the secrets of making cement and 1300 years passed before it was rediscovered. Part of the secret of cement is that its ingredients have to be well mixed, and as long as they are being mixed, they don't solidify. So it was only a few years after the first cars rolled down the road that the first patent for a cement mixing truck was granted. A hundred and some odd years later we put one on a shirt because our kid's love 'em.

This shirt features a special flatbed pumper trailer that refills cement mixers with concrete ingredients.