Black and white drawing of a pendulum on a stand with a clock in the…

Black and white photo of a building with a clock tower

Two Bosch laser distance measurers

Black and white drawing of a decorative design on a white background

Old black and white photo of a large building with windows

Painting of sailboats in the water near a rocky shoreline

Topographic map of the surface of Mars

Black and white drawing of four different types of windows

Black and white drawing of a monument with a statue on top of it