# Relationship history for MSHA mine 1506373

Current hierarchy: **Epling Phillip K → Quality Fuel Inc → No 1 Tipple**

- 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:** Elkhorn Fuel Inc → No 1 Tipple; 1950-01-01 to 1982-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Justice Virgil → No 1 Tipple; 1950-01-01 to 1982-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Justice Virgil → Elkhorn Fuel Inc; 1950-01-01 to 1982-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Fields Victor & James Eddie Et Al → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Layne Processing Inc → No 1 Tipple; 1982-05-10 to 1984-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Layne Patrick R → No 1 Tipple; 1982-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Patrick R → Layne Processing Inc; 1982-05-10 to 1984-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Johnie Childers Coal Company → No 1 Tipple; 1984-05-18 to 1984-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Fields Victor & James Eddie Et Al → Johnie Childers Coal Company; 1984-05-18 to 1984-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Quality Fuel Inc → No 1 Tipple; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Epling Phillip K → No 1 Tipple; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Epling Phillip K → Quality Fuel Inc; 1984-07-16 to current/open; source msha-controller-operator-history