# Relationship history for MSHA mine 1515444

Current hierarchy: **Miles Henry Eddie → Summar Coal Company → Summar #4**

- 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:** Watson Tom Et Al → Summar #4; 1985-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miles Henry Eddie → Summar #4; 1985-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Christie Coal Company → Summar #4; 1985-11-01 to 1986-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Watson Tom Et Al → Christie Coal Company; 1985-11-01 to 1986-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Summar Coal Company → Summar #4; 1986-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miles Henry Eddie → Summar Coal Company; 1986-05-21 to current/open; source msha-controller-operator-history