# Relationship history for MSHA mine 4502174

Current hierarchy: **Ellestad Roland → Rock Rats Crushing → Haley 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:** G & W Crushing Inc → Haley Pit; 1950-01-01 to 1980-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Watson Cleon H → Haley Pit; 1950-01-01 to 1981-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Watson Cleon H → G & W Crushing Inc; 1950-01-01 to 1980-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Rock Rats Crushing → Haley Pit; 1980-04-17 to 1980-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Ellestad Roland → Haley Pit; 1980-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellestad Roland → Rock Rats Crushing; 1980-04-17 to 1980-10-15; source msha-controller-operator-history
- **operator_operates_mine:** G & W Crushing Inc → Haley Pit; 1980-10-16 to 1981-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Watson Cleon H → G & W Crushing Inc; 1980-10-16 to 1981-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Rock Rats Crushing → Haley Pit; 1981-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellestad Roland → Rock Rats Crushing; 1981-11-17 to current/open; source msha-controller-operator-history