# Relationship history for MSHA mine 4103018

Current hierarchy: **Meridian Aggregates Company LP → Meridian Aggregates Company → RICHLAND 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

- **controller_controls_mine:** William  Boorhem  et al → RICHLAND PLANT; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bobby Rutherford Inc → RICHLAND PLANT; 1980-06-01 to 1981-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Rutherford Bobby & Baker Marine → RICHLAND PLANT; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rutherford Bobby & Baker Marine → Bobby Rutherford Inc; 1980-06-01 to 1981-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Ready Rock → RICHLAND PLANT; 1981-07-27 to 1982-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Rutherford Bob & Charles Crook → RICHLAND PLANT; 1981-07-27 to 1982-12-15; source msha-controller-operator-history
- **controller_controls_operator:** Rutherford Bob & Charles Crook → Ready Rock; 1981-07-27 to 1982-12-15; source msha-controller-operator-history
- **operator_operates_mine:** Boorhem-Fields Inc → RICHLAND PLANT; 1982-12-16 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_operator:** William  Boorhem  et al → Boorhem-Fields Inc; 1982-12-16 to 1993-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → RICHLAND PLANT; 1991-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → RICHLAND 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