# Relationship history for MSHA mine 3606634

Current hierarchy: **Gillis Walter L → Walter L Gillis → Walter L Gillis**

- 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:** Walter L Gillis → Walter L Gillis; 1978-05-01 to 1981-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Gillis Walter L → Walter L Gillis; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gillis Walter L → Walter L Gillis; 1978-05-01 to 1981-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Fort Necessity Coal → Walter L Gillis; 1981-12-03 to 1982-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Jordon James → Walter L Gillis; 1981-12-03 to 1982-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Jordon James → Fort Necessity Coal; 1981-12-03 to 1982-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Walter L Gillis → Walter L Gillis; 1982-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gillis Walter L → Walter L Gillis; 1982-12-15 to current/open; source msha-controller-operator-history