- ABB Power Inc.
- American Wire & Cable Co.
- Asia Brewery Inc.
- Batangas II Elect. Coop. Inc.
- Cabanatuan Electric Corp.
- Caltex Philippines
- Coca-Cola Bottlers Phils.
- Daelim Philippines Inc.
- EEI Corporation
- Interconglomerates, Inc.
- Jits Construction Corp.
- Manila Electric Co. (MERALCO)
- Miescor Builders, Inc.
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- Peninsula Elect. Coop. Inc.
- Phil. Phosphate Fertilizer
- Pilipinas Shell - Refinery
- Pilipinas Shell Petroleum
- PNOC
- Raytheon Ebasco Overseas Ltd.
- San Miguel Brewing Group
- San Miguel Corporation
- Siemens Incorporated
- Sothern Energy Inc.
- Stephan Philippines
- Subic Power Corp.
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