# Relationship history for MSHA mine 1504261

Current hierarchy: **CRH PLC → Hinkle Contracting Company LLC → Glass Sand & Gravel**

- 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

- **operator_operates_mine:** Green River Sand & Gravel Company Inc → Glass Sand & Gravel; 1950-01-01 to 1982-08-23; source msha-controller-operator-history
- **controller_controls_mine:** W J  Crowe → Glass Sand & Gravel; 1950-01-01 to 1982-08-23; source msha-controller-operator-history
- **controller_controls_operator:** W J  Crowe → Green River Sand & Gravel Company Inc; 1950-01-01 to 1982-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Glass Sand & Gravel; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Southern Aggregates Inc → Glass Sand & Gravel; 1982-08-24 to 1990-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  James III → Glass Sand & Gravel; 1982-08-24 to 1990-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  James III → Southern Aggregates Inc; 1982-08-24 to 1990-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Aggregate-Division of Larry Glass Const → Glass Sand & Gravel; 1990-06-07 to 2006-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Larry T  Glass → Glass Sand & Gravel; 1990-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry T  Glass → Kentucky Aggregate-Division of Larry Glass Const; 1990-06-07 to 2006-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Glass Paving & Stone → Glass Sand & Gravel; 2006-06-23 to 2008-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Glass Paving & Stone; 2006-06-23 to 2008-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Glass Aggregates LLC → Glass Sand & Gravel; 2008-06-16 to 2021-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Glass Sand & Gravel; 2008-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Glass Aggregates LLC; 2008-06-16 to 2021-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Company LLC → Glass Sand & Gravel; 2021-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Company LLC; 2021-01-08 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Glass Sand & Gravel; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Glass Paving & Stone; 2022-05-14 to 2008-06-15; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Company LLC; 2022-05-14 to current/open; source msha-controller-operator-history