# Relationship history for MSHA mine 4502762

Current hierarchy: **Fegert Earl R → Sanroc → Westlake 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

- **operator_operates_mine:** C H Watson Construction → Westlake Pit; 1980-01-01 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Watson Cleon H → Westlake Pit; 1980-01-01 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Watson Cleon H → C H Watson Construction; 1980-01-01 to 1981-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Sanroc → Westlake Pit; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fegert Earl R → Westlake Pit; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fegert Earl R → Sanroc; 1981-10-01 to current/open; source msha-controller-operator-history