# Relationship history for MSHA mine 1513866

Current hierarchy: **Comer Roger → Wilco Mining Company 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:** Bowling Charles D Et Al → No 1; 1978-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crystal Star Coal Company Inc → No 1; 1982-12-01 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Bowling Charles D Et Al → Crystal Star Coal Company Inc; 1982-12-01 to 1983-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Lariat Coal Company Inc → No 1; 1983-03-21 to 1983-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Helmandollar Sam → No 1; 1983-03-21 to 1983-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Helmandollar Sam → Lariat Coal Company Inc; 1983-03-21 to 1983-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Mount Zion Coal Company Inc → No 1; 1983-10-27 to 1984-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Workman Benjamin Et Al → No 1; 1983-10-27 to 1984-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Workman Benjamin Et Al → Mount Zion Coal Company Inc; 1983-10-27 to 1984-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Wilco Mining Company Inc → No 1; 1984-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Comer Roger → No 1; 1984-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Comer Roger → Wilco Mining Company Inc; 1984-06-20 to current/open; source msha-controller-operator-history