1942

1945

• Com­pa­ny found­ed by Egon Graf in Ehnin­gen near Böblin­gen
• Ca­pac­i­tors for ra­dios
• AC ca­pac­i­tors for elec­tric mo­tors
• TES­LA trans­form­ers

1954

1955

• High volt­age ca­pac­i­tors
• High volt­age gen­er­a­tors
• High volt­age trans­form­ers
• High volt­age con­trol de­vices
• High volt­age ca­pac­i­tors for elec­tron mi­cro­scopes

1965

• De­vel­op­ment and con­struc­tion of 100 KV tubu­lar elec­tro­stat­ic air fil­ters
• High volt­age trans­form­ers for den­tal X-ray equip­ment
• High volt­age test in­stru­ments for vi­tal­i­ty test­ing in den­tistry

1970

• De­vel­op­ment and con­struc­tion of a mag­ne­tother­a­py de­vice
• Portable high volt­age gen­er­a­tor for an "elec­tric paint­brush"

Since 1983

• In­ven­tion of the in­te­grat­ed cas­cade
• De­vel­op­ment of HV-Gen­er­a­tor NQ 85 with in­te­grat­ed tubu­lar cas­cade
• De­vel­op­ment of HV-Gen­er­a­tor HG 85 with in­te­grat­ed tubu­lar cas­cade
• De­vel­op­ment of a ca­pac­i­tor com­bi­na­tion for Zeiss
• De­vel­op­ment of the HEX-Se­ries with pow­er board

1984

1985

1990

1994

1996

• De­vel­op­ment of par­tial-dis­charge-free trans­form­ers
• HV-Trans­former HT 40
• HV-Trans­former HT 50

2001

2002

• Start of mass pro­duc­tion of minia­turised high volt­age gen­er­a­tors for paint­ing robots in the au­to­mo­tive in­dus­try De­vel­op­ments since 2002:
• HV-Gen­er­a­tor GE 200
  (100 KV/200 W)
• HV-Gen­er­a­tor GE 400
  (100 KV/400 W)
• HV-Gen­er­a­tor GE 9P RO2
  (100 KV/ 9 W)
• Pow­er Board R 101-36 ST
• Pow­er Board R 101-36 DB
• Pow­er Board R 101-36 X3
• Pow­er-Mul­ti­pli­ca­tion of cur­rent by join­ing two or more gen­er­a­tors
• HV-Switch HUS 101

2009

2010

2013