# Relationship history for MSHA mine 1516390

Current hierarchy: **Hamilton Doug → Carbon Coal Inc → No 1**

- 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

- **controller_controls_mine:** Hitchcock Cecil → No 1; 1984-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & C Mining Inc → No 1; 1988-05-01 to 1988-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Hitchcock Cecil → B & C Mining Inc; 1988-05-01 to 1988-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Carbon Coal Inc → No 1; 1988-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Doug → No 1; 1988-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Doug → Carbon Coal Inc; 1988-06-20 to current/open; source msha-controller-operator-history