Black and white drawing of a man with a mustache wearing a suit

Open book with a drawing of two ducks swimming in the water

Drawing of a machine with a spring attached to it

Drawing of two hands holding a caliper

Black and white photo of a woman with a warm smile on her face

Group of men standing next to each other on a snow-covered field

Black and white drawing of a building with a lot of windows

Black and white drawing of a man and woman sitting at a table

Black and white drawing of an ornate design in the middle of a frame