# Relationship history for MSHA mine 0101999

Current hierarchy: **Watkins John R → C & W Coal Company Inc → Blockton Pit #2**

- 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:** Watkins John R → Blockton Pit #2; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & W Coal Company Inc → Blockton Pit #2; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Watkins John R → C & W Coal Company Inc; 1979-01-01 to current/open; source msha-controller-operator-history