Of course the internet and the nearest public library is of great help, but my own collection of books on old technology is also a valuable source of information. For those not obsessed with building up one's own library, many public archives are in the proces of uploading books and images online for free browsing. If in doubt you can always consult an online modelling forum for help.
|A book on SKF ball and roller bearings. A nice introduction to the multitude of products from the Swedish Company. My example is from 1958.|
|An advertisement for SKF ball bearings from a Danish engineering magazine, 1945.|
|Another SKF item. A black leather box...|