# Relationship history for MSHA mine 1504600

Current hierarchy: **CRH PLC → Hinkle Contracting Corp → Chintown Quarry**

- 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:** Summit Materials LLC → Chintown Quarry; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Genex/Greer Inc → Chintown Quarry; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Genex/Greer Inc → Chintown Quarry; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Genex/Greer Inc → Genex/Greer Inc; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** American Concrete Pumping Company Inc → Chintown Quarry; 1979-04-01 to 1983-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Maus Joe → Chintown Quarry; 1979-04-01 to 1983-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Maus Joe → American Concrete Pumping Company Inc; 1979-04-01 to 1983-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Corp → Chintown Quarry; 1983-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Corp; 1983-11-02 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Chintown Quarry; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Corp; 2022-05-14 to current/open; source msha-controller-operator-history