Patent_application_number,Applicant_name,Year_of_application,Patent_system
JP1993284999A,HITACHI LTD,1993,JPO
JP2008245604A,HITACHI LTD,2008,JPO
JP2009148205A,HITACHI LTD,2009,JPO
JP2010104304A,HITACHI LTD,2010,JPO