# Relationship history for MSHA mine 4502721

Current hierarchy: **Hanson PLC → Acme Materials & Construction Company → Wandermere 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Cunningham Gary L → Wandermere Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Spokane Pre-Mix → Wandermere Pit; 1980-03-01 to 1983-01-10; source msha-controller-operator-history
- **controller_controls_mine:** DeAtley A Neil & Skip Dahlen → Wandermere Pit; 1980-03-01 to 1983-01-10; source msha-controller-operator-history
- **controller_controls_operator:** DeAtley A Neil & Skip Dahlen → Little Spokane Pre-Mix; 1980-03-01 to 1983-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Spokane Rock Products → Wandermere Pit; 1983-01-11 to 1984-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → Wandermere Pit; 1983-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → Spokane Rock Products; 1983-01-11 to 1984-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Cunningham Sand & Gravel Company Inc → Wandermere Pit; 1984-09-12 to 1985-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Cunningham Gary L → Cunningham Sand & Gravel Company Inc; 1984-09-12 to 1985-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Donald H  Herak → Wandermere Pit; 1985-09-05 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Cunningham Sand & Gravel Company Inc → Wandermere Pit; 1985-09-19 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Donald H  Herak → Cunningham Sand & Gravel Company Inc; 1985-09-19 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Cunningham Sand & Gravel Company → Wandermere Pit; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Wandermere Pit; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Cunningham Sand & Gravel Company; 1988-07-15 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Acme Materials & Construction Company → Wandermere Pit; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Wandermere Pit; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Acme Materials & Construction Company; 1988-11-14 to current/open; source msha-controller-operator-history