# Relationship history for MSHA mine 3300049

Current hierarchy: **CRH PLC → Shelly Materials Inc → East Liberty 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → East Liberty Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Connolly Construction Company → East Liberty Quarry; 1950-01-01 to 1991-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Phillip F  Connolly → East Liberty Quarry; 1950-01-01 to 1991-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Phillip F  Connolly → Connolly Construction Company; 1950-01-01 to 1991-04-23; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → East Liberty Quarry; 1990-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates Corp → East Liberty Quarry; 1991-04-24 to 1997-05-27; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → American Aggregates Corp; 1991-04-24 to 1997-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → East Liberty Quarry; 1997-05-28 to 2002-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1997-05-28 to 2002-05-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → East Liberty Quarry; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → East Liberty Quarry; 2002-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2002-06-01 to current/open; source msha-controller-operator-history