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File:Patent-US-1452674.pdf |Marca=Security Pen Corporation ...ontraffazione degli assegni, usato nelle [[Security Pen]] della [[Security Pen Corporation]].(1 159 × 1 704 (175 KB)) - 01:33, 12 dic 2021
File:Patent-US-1480690.pdf |Marca=Security Pen Corporation ...ontraffazione degli assegni, usato nelle [[Security Pen]] della [[Security Pen Corporation]]. {{SamePatent|CA|237099}}(1 159 × 1 704 (189 KB)) - 01:33, 12 dic 2021
File:Patent-CA-255206.pdf |Assignee=William J. Michael, Security Pen Corporation |Titolo=Fountain Pen(1 239 × 1 754 (443 KB)) - 02:16, 11 dic 2021
File:Patent-US-1825014.pdf |Marca=Security Pen Corporation ...curezza contro la contraffazione degli assegni, attribuito alla [[Security Pen Corporation]] come altri brevetti dello stesso inventore.(1 159 × 1 704 (210 KB)) - 01:45, 12 dic 2021
File:Patent-US-1339359.pdf |Assignee=Illinois Pen Company |Marca=Security Pen Corporation(1 159 × 1 704 (156 KB)) - 01:21, 12 dic 2021
File:Patent-US-1482568.pdf |Titolo=Fountain Pen |Marca=Security Pen Corporation(1 159 × 1 704 (195 KB)) - 01:23, 12 dic 2021
File:Patent-US-1459073.pdf |Titolo=Self-filling fountain pen |Marca=Security Pen Corporation(1 159 × 1 704 (385 KB)) - 01:32, 12 dic 2021
File:Patent-US-1372011.pdf |Assignee=Settles Pen Company |Titolo=Fountain-pen attachment(1 159 × 1 704 (154 KB)) - 01:24, 12 dic 2021
File:Patent-US-1483675.pdf |Marca=Security Pen Corporation(1 159 × 1 704 (242 KB)) - 01:34, 12 dic 2021
File:JapaneseEyedropper.svg |Note_en=Diagram of a pen with security eyedropper filler. Drawn by the author with [http://www.inkscape.org/ Inksc(6 771 × 546 (142 KB)) - 01:34, 18 dic 2021
