# Relationship history for MSHA mine 4605100

Current hierarchy: **Phillips Harrison → Saturn Coal 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

- **operator_operates_mine:** Calloway Mining Inc → No 1; 1976-04-01 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_mine:** William  Calloway → No 1; 1976-04-01 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_operator:** William  Calloway → Calloway Mining Inc; 1976-04-01 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Blair John → No 1; 1983-07-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John Roger Mining Inc → No 1; 1984-08-28 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Blair John → John Roger Mining Inc; 1984-08-28 to 1986-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Saturn Coal Company Inc → No 1; 1986-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Harrison → No 1; 1986-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Harrison → Saturn Coal Company Inc; 1986-06-30 to current/open; source msha-controller-operator-history