# Relationship history for MSHA mine 1401334

Current hierarchy: **CRH PLC → Apac-Kansas Inc  Shears Division → HARTFORD 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:** Ashland Inc → HARTFORD QUARRY; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Glen E  Gilpin → HARTFORD QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Shears Jr → HARTFORD QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blacktop Construction Company Inc → HARTFORD QUARRY; 1979-10-01 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Glen E  Gilpin → Blacktop Construction Company Inc; 1979-10-01 to 1988-05-03; source msha-controller-operator-history
- **operator_operates_mine:** J H Shears' Sons Inc → HARTFORD QUARRY; 1988-05-04 to 1988-12-28; source msha-controller-operator-history
- **controller_controls_operator:** William  Shears Jr → J H Shears' Sons Inc; 1988-05-04 to 1988-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Couch Construction Materials → HARTFORD QUARRY; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Superfos America Inc → HARTFORD QUARRY; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Superfos America Inc → Couch Construction Materials; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Kansas Inc  Shears Division → HARTFORD QUARRY; 2000-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Kansas Inc  Shears Division; 2000-02-22 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → HARTFORD QUARRY; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Apac-Kansas Inc  Shears Division; 2006-08-28 to current/open; source msha-controller-operator-history