# Relationship history for MSHA mine 1500044

Current hierarchy: **John G Liter → Liter's Inc. → IRVINGTON 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

- **operator_operates_mine:** Kentucky Stone Company → IRVINGTON QUARRY; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → IRVINGTON QUARRY; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Kentucky Stone Company; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest, Inc. → IRVINGTON QUARRY; 1988-11-14 to 2005-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → IRVINGTON QUARRY; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest, Inc.; 1988-11-14 to 2005-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Robert T  Liter et al → IRVINGTON QUARRY; 1993-07-01 to 2025-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Liter's Inc. → IRVINGTON QUARRY; 2005-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert T  Liter et al → Liter's Inc.; 2005-12-19 to 2025-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → IRVINGTON QUARRY; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest, Inc.; 2007-08-23 to 2005-12-18; source msha-controller-operator-history
- **controller_controls_mine:** John G Liter → IRVINGTON QUARRY; 2025-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John G Liter → Liter's Inc.; 2025-01-09 to current/open; source msha-controller-operator-history