These are the interchangeable heads for our office typewriter that has long been discarded.
I remember when 'golf-ball' typewritters were first released - it was amazing technology! You had to change the 'golf-ball' to change the font (from Times New Roman to Arial).
It seems somewhat sad that these lovely objects have 'served their purpose' and are now destined for the bin.
I remember these. I didn't like them cos I couldn't jam all the keys together on the typewriters at dad's work anymore :( Great shot, love the way you've presented it.