# Relationship history for MSHA mine 3606875

Current hierarchy: **Pioneer International Ltd → Pioneer Mid-Atlantic Inc → CONNELLSVILLE PLANT**

- 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:** Davison Stone Company → CONNELLSVILLE PLANT; 1979-01-01 to 1989-01-15; source msha-controller-operator-history
- **controller_controls_mine:** F R G Industries Inc → CONNELLSVILLE PLANT; 1979-01-01 to 1989-01-15; source msha-controller-operator-history
- **controller_controls_operator:** F R G Industries Inc → Davison Stone Company; 1979-01-01 to 1989-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Mid-Atlantic Inc → CONNELLSVILLE PLANT; 1989-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → CONNELLSVILLE PLANT; 1989-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer Mid-Atlantic Inc; 1989-01-16 to current/open; source msha-controller-operator-history