Index of /bitsavers.org/pdf/singer/4310_4320/pbe/

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pictures/                                          11-Aug-2024 17:17                   -
4311_4321.jpg                                      11-Aug-2024 17:16              146213
Pertec_Business_Systems_formed_197201.jpg          11-Aug-2024 17:16              100956
patent_219281.jpg                                  11-Aug-2024 17:16              262613
patent_219981.pdf                                  11-Aug-2024 17:34               51353
patent_3623001.pdf                                 11-Aug-2024 17:25             1435086
patent_3623002.pdf                                 11-Aug-2024 17:34             1014841
patent_3715738.pdf                                 11-Aug-2024 17:34              572411
patent_3803555.pdf                                 11-Aug-2024 17:34              962661