I offer a collection of 135 (!) patents of the wellknown firm Schwinn Bicycle (Chivago, USA) or inventors of this company, published between 1914 and 1980.
They are from USA or Great Britain and busy mostly with bicycles or bicycle parts like frames, brackets, cariers, stands, bicycle training attachment and other things (some of the older patents are busy with refrigerating technique).
All patents are complete, that means contain the full text and all drawings (see example). You will get a professional overview about the technical developments of this company which you find nowhere in the world in this good quality / completeness. You can learn a lot about the technical details of old bicycle technique.
Delivery is as a zipped file with a patent collection of pdf files (not printed, not a book). You need only the wellknown free programme Acrobat Reader or a similar one to open the files. You can also print each file.