# Relationship history for MSHA mine 4605718

Current hierarchy: **Hamner Keith → Capitol Coal Company Inc → #1 Surface**

- 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:** Hamner Keith → #1 Surface; 1974-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Coal Company Inc → #1 Surface; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamner Keith → Capitol Coal Company Inc; 1978-02-01 to current/open; source msha-controller-operator-history