Printing quoins are expanding blocks used to secure the type to the chase (frame).
Fullsize image: https://s3-us-west-1.amazonaws.com/h...g_fullsize.jpg
Previously:
Gutenberg press replica - photo
Feeder for Heidelberg printing press - GIF
Restored 1909 printing press - GIF
Vintage cast iron paper cutter - photo and video
Paper stack splitting machine - GIF
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