# Relationship history for MSHA mine 4401578

Current hierarchy: **Sparks Eddie Dean → Ranco 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:** Lane Hollow Coal Company Inc → No 1; 1950-01-01 to 1971-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Justus Ruby Helen → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justus Ruby Helen → Lane Hollow Coal Company Inc; 1950-01-01 to 1971-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Hackney Coal Company → No 1; 1971-12-01 to 1978-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Hackney Frank W → No 1; 1971-12-01 to 1978-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Hackney Frank W → Hackney Coal Company; 1971-12-01 to 1978-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Harry V → No 1; 1977-12-01 to 1980-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Creek Coal Company → No 1; 1978-05-11 to 1980-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Harry V → Cedar Creek Coal Company; 1978-05-11 to 1980-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Ranco Coal Company Inc → No 1; 1980-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Eddie Dean → No 1; 1980-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Eddie Dean → Ranco Coal Company Inc; 1980-02-07 to current/open; source msha-controller-operator-history