# Relationship history for MSHA mine 0301573

Current hierarchy: **Stan O  Ingram → Greenville Gravel Company → Greenville Gravel Dredge**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Stan O  Ingram → Greenville Gravel Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Greenville Gravel Company → Greenville Gravel Dredge; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stan O  Ingram → Greenville Gravel Company; 1984-03-01 to current/open; source msha-controller-operator-history