# Relationship history for MSHA mine 1515137

Current hierarchy: **Martin Tom → Cedar Creek Coal Corp → Stambaugh Processing**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cedar Creek Coal Corp → Stambaugh Processing; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Tom → Stambaugh Processing; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Tom → Cedar Creek Coal Corp; 1985-02-01 to current/open; source msha-controller-operator-history