# Relationship history for MSHA mine 3301480

Current hierarchy: **CRH PLC → Shelly Materials Inc → Lockbourne Plant**

- 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:** Shelly & Sands Inc → Lockbourne Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Daniel Sand & Gravel Inc → Lockbourne Plant; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  McDaniel → Lockbourne Plant; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  McDaniel → Mc Daniel Sand & Gravel Inc; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Eakin Development Company → Lockbourne Plant; 1979-04-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Capital City Excavating Company → Lockbourne Plant; 1979-04-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Capital City Excavating Company → Eakin Development Company; 1979-04-01 to 1982-11-30; source msha-controller-operator-history
- **operator_operates_mine:** S & S Aggregate → Lockbourne Plant; 1982-12-01 to 2003-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Shelly & Sands Inc → S & S Aggregate; 1982-12-01 to 2003-01-26; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Lockbourne Plant; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Lockbourne Plant; 2003-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2003-01-27 to current/open; source msha-controller-operator-history