# Relationship history for MSHA mine 4603779

Current hierarchy: **Hawley Charbon → Hawley Coal Mining Corp → Willis Branch Ramp**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Imperial Coal & Construction Company Inc → Willis Branch Ramp; 1950-01-01 to 1977-09-14; source msha-controller-operator-history
- **controller_controls_mine:** T W Oil Inc → Willis Branch Ramp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → Imperial Coal & Construction Company Inc; 1950-01-01 to 1977-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Charbon → Willis Branch Ramp; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R P S Corp → Willis Branch Ramp; 1977-09-15 to 1977-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Steele Roger P → Willis Branch Ramp; 1977-09-15 to 1977-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Steele Roger P → R P S Corp; 1977-09-15 to 1977-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Pott Of Coal Inc → Willis Branch Ramp; 1977-12-07 to 1979-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Philpott Edward Leigh → Willis Branch Ramp; 1977-12-07 to 1979-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Philpott Edward Leigh → Pott Of Coal Inc; 1977-12-07 to 1979-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Hawley Coal Mining Corp → Willis Branch Ramp; 1979-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → Hawley Coal Mining Corp; 1979-04-11 to current/open; source msha-controller-operator-history