# Relationship history for MSHA mine 1505179

Current hierarchy: **Fields Mason & Larry Ratliff → Big Three Coal Company → 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:** Michael Coal Company Inc → No 1; 1950-01-01 to 1979-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Bishop Bill Ray → No 1; 1950-01-01 to 1979-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Bishop Bill Ray → Michael Coal Company Inc; 1950-01-01 to 1979-04-27; source msha-controller-operator-history
- **operator_operates_mine:** P & S Mining & Construction Company Inc → No 1; 1979-04-28 to 1979-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Prewitt Mosie → No 1; 1979-04-28 to 1979-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Prewitt Mosie → P & S Mining & Construction Company Inc; 1979-04-28 to 1979-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Big Three Coal Company → No 1; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fields Mason & Larry Ratliff → No 1; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Mason & Larry Ratliff → Big Three Coal Company; 1979-08-22 to current/open; source msha-controller-operator-history