shingeki no kyojin
silhouette of a man with a gear mechanism in the head, vector illustration Stock Photo - 14381550
mecanical gears | Mechanical Background With Gears And Cogs Stock Photo 55163296 ...
Images from an Arabic manuscript featuring schematics for water powered systems, pulleys and gearing mechanisms. The date is unknown but is thought to be from sometime between the 16th and 19th century.