- Chevron Pipeline Co
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- Chi-Cap Pipeline Co
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- Chicap Pipe Line Co Inc
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- Choctaw Resources
- Christiansen Pipeline Inc
- CITC
- Citgo Petroleum Corp
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- CITGO Pipe Line Co
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- City Of Salem Pipeline Constr
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- Colorado Interstate Gas
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- Commonwealth Gas Pipeline Corp
- Communications & Electrical
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- Conoco Phillips
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- Continental Natural Gas Inc
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