# Relationship history for MSHA mine 1800697

Current hierarchy: **St Clair Thomas K → Rising Sons' Enterprises Inc → Rising Sons' Pit**

- 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:** St Clair Samuel L → Rising Sons' Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Md-Va Sand Company → Rising Sons' Pit; 1983-06-01 to 1991-09-25; source msha-controller-operator-history
- **controller_controls_operator:** St Clair Samuel L → Md-Va Sand Company; 1983-06-01 to 1991-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Rising Sons' Enterprises Inc → Rising Sons' Pit; 1991-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** St Clair Thomas K → Rising Sons' Pit; 1991-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Clair Thomas K → Rising Sons' Enterprises Inc; 1991-09-26 to current/open; source msha-controller-operator-history