Picryl description: Public domain photograph of a machine, industrial equipment, engine, generator, free to use, no copyright restrictions.
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Public domain scan of 17th-century drawing, free to use, no copyright restrictions image - Picryl description
Public domain image of architecture, drawing building, free to use, no copyright restrictions image - Picryl description
Public domain scan of an art print, free to use, no copyright restrictions image - Picryl description