# Relationship history for MSHA mine 2301828

Current hierarchy: **Bussen Realty Co; Missouri Gravel Co → Bussen Quarries Inc → Underground Plant #5**

- 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:** Riverstone Group → Underground Plant #5; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Missouri Gravel Co  et al → Underground Plant #5; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → Underground Plant #5; 1980-10-01 to 1984-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 1980-10-01 to 1984-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Bussen Quarries Inc → Underground Plant #5; 1984-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Missouri Gravel Co  et al → Bussen Quarries Inc; 1984-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bussen Realty Co et al → Bussen Quarries Inc; 1984-04-15 to current/open; source msha-controller-operator-history