# Relationship history for MSHA mine 4403250

Current hierarchy: **Pittston Company → Motivation Coal Company → Leetown 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:** Wellmore Coal Corp → Leetown Tipple; 1950-01-01 to 1986-04-07; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Leetown Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1950-01-01 to 1986-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Leetown Tipple; 1985-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Motivation Coal Company → Leetown Tipple; 1986-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Motivation Coal Company; 1986-04-08 to current/open; source msha-controller-operator-history