# Relationship history for MSHA mine 3400570

Current hierarchy: **Meridian Aggregates Company LP → Meridian Aggregates Company → APPLE 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:** H D Youngman Contractor Inc → APPLE PLANT; 1950-01-01 to 1983-04-11; source msha-controller-operator-history
- **controller_controls_mine:** H D  Youngman → APPLE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H D  Youngman → H D Youngman Contractor Inc; 1950-01-01 to 1983-04-11; source msha-controller-operator-history
- **controller_controls_mine:** William  Boorhem  et al → APPLE PLANT; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boorhem-Fields Inc → APPLE PLANT; 1983-04-12 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_operator:** William  Boorhem  et al → Boorhem-Fields Inc; 1983-04-12 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → APPLE PLANT; 1991-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → APPLE PLANT; 1993-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian Aggregates Company; 1993-03-15 to current/open; source msha-controller-operator-history