# Relationship history for MSHA mine 4601884

Current hierarchy: **Ewald Bernard → Gallia Coal Inc → Williams Mine**

- 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:** Williams Coal Company → Williams Mine; 1950-01-01 to 1974-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Williams Coal Co → Williams Mine; 1950-01-01 to 1974-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Williams Coal Co → Williams Coal Company; 1950-01-01 to 1974-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Ohio Valley Coals Inc → Williams Mine; 1974-02-07 to 1976-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Zuspan William F → Williams Mine; 1974-02-07 to 1976-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan William F → Ohio Valley Coals Inc; 1974-02-07 to 1976-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Ohio Valley Coals Inc → Williams Mine; 1976-03-24 to 1976-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Vandergalien James → Williams Mine; 1976-03-24 to 1976-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Vandergalien James → Ohio Valley Coals Inc; 1976-03-24 to 1976-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Gallia Coal Inc → Williams Mine; 1976-06-21 to 1977-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Zuspan Edgar L → Williams Mine; 1976-06-21 to 1977-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan Edgar L → Gallia Coal Inc; 1976-06-21 to 1977-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Gallia Coal Inc → Williams Mine; 1977-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ewald Bernard → Williams Mine; 1977-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ewald Bernard → Gallia Coal Inc; 1977-04-18 to current/open; source msha-controller-operator-history