https://patentimages.storage.googleapis.com/f4/02/b9/f8eb143b19e7c7/US95929.pdf https://patentimages.storage.googleapis.com/54/72/f0/2cb58e57d694f9/US538693.pdf https://patentimages.storage.googleapis.com/b3/a1/f3/ab167e8bbd357e/US568274.pdf https://patentimages.storage.googleapis.com/ca/c4/ae/1a59a812759fec/US571188.pdf https://patentimages.storage.googleapis.com/be/d4/b0/28b4db956f25ec/US573681.pdf
https://patentimages.storage.googleapis.com/53/ab/03/6932f4587e2ec8/US576395.pdf
(post is archived)