# Relationship history for MSHA mine 2300191

Current hierarchy: **Colas S A → Southeast Missouri Stone Company → Southeast Missouri Stone Company**

- 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

- **operator_operates_mine:** Southeast Missouri Stone Company → Southeast Missouri Stone Company; 1950-01-01 to 1993-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Southern Illinois Stone Company → Southeast Missouri Stone Company; 1950-01-01 to 1993-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Southern Illinois Stone Company → Southeast Missouri Stone Company; 1950-01-01 to 1993-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Southeast Missouri Stone Company → Southeast Missouri Stone Company; 1993-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Southeast Missouri Stone Company; 1993-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Southeast Missouri Stone Company; 1993-01-29 to current/open; source msha-controller-operator-history