4. Dynamic magnetic information storage or retrieval
  5. Monitoring or testing the progress of recording

Hitachi Computer Peripherals Co., Ltd.

Corporate Assignee

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Backup power supply

Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate

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Backup power supply

Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate

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Bi-directional DC-DC converter and method for controlling...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate

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Bi-directional DC-DC converter and method for controlling...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate

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Bidirectional DC-DC converter and power supply apparatus...

Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate

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