Certificates
PEJ commitment to quality (Japanese)
ISO9001 certificate (Japanese)
ISO9001 certificate (English)
Patent of a ventilation unit with heat exchanger (Japanese)
Seseragi trademark registration
Seseragi α trademark registration
Gauss Fan trademark registration
PEJ super ventilation trademark registration
PEJ ventilation trademark registration
Breathing type ventilation trademark registration
European patent of a fan unit invention
Certificate of membership | Japan Builders Network
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