Early patent diagrams for something. How do we know these today?

Cracked by: udupendra, Ananth, Goyal, apar, Pawankumar Hegde, Rogi, dineshk, Mikey, username, jowens, krudebox, Dhan, Bharath, Thejas V R, Raghuvansh, shenoyvarun86, Shwetha Maiya and quaziluffy

This question was, apparently, previously featured on shenoyvarun86’s blog. The petering was completely accidental :-)