1
William O Dussell, James M Janky, John F Schipper, David J Cowl: Position based personal digital assistant. Trimble Navigation, Blakely Sokoloff Taylor & Zafman, August 17, 1999: US05938721 (722 worldwide citation)

A task description is stored in a database accessible by a mobile computer system. The mobile computer system receives positioning information corresponding to its geographic location and indexes the database based on the positioning information when the information indicates that the mobile compute ...


2
William O Dussell, James M Janky, John F Schipper, David J Cowl: Position based personal digital assistant. Trimble Navigation, Blakely Sokoloff Taylor & Zafman, June 25, 2002: US06411899 (269 worldwide citation)

A task description is stored in a database accessible by a mobile computer system. The mobile computer system receives positioning information corresponding to its geographic location and indexes the database based on the positioning information when the information indicates that the mobile compute ...


3
William O Dussell, James M Janky, John F Schipper, David J Cowl: Position based personal digital assistant. Trimble Navigation, Blakely Sokoloff Taylor & Zafman, July 24, 2001: US06266612 (256 worldwide citation)

A task description is stored in a database accessible by a mobile computer system. The mobile computer system receives positioning information corresponding to its geographic location and indexes the database based on the positioning information when the information indicates that the mobile compute ...


4
William O Dussell, James M Janky, John F Schipper, David J Cowl: Position based personal digital assistant. Blakely Sokoloff Taylor & Zafman, August 30, 2001: US20010018663-A1

A task description is stored in a database accessible by a mobile computer system. The mobile computer system receives positioning information corresponding to its geographic location and indexes the database based on the positioning information when the information indicates that the mobile compute ...