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| Here is an amazing collection of nearly 1,000 U.S. & foreign patents on combination padlocks in pdf file format. Full text & images, all patents in this category from the early 19th Century to the present day. Files are arranged in folders by Patent Office Class, then numerically & chronologically by patent number. All files are fully viewable & printable. (Adobe Acrobat or equivalent (free download) is required to view the files, as well as a CD-ROM drive & PC-type computer). Patents are searchable by patent number, inventor's name & company name. This collection is a must for any lock collector, historian or student of locks or mechanical design. |
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