# Relationship history for MSHA mine 2301253

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Marshall Junction 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:** Martin Marietta Materials Inc → Marshall Junction Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Howard Quarries Inc → Marshall Junction Quarry; 1950-01-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Howard Olen → Marshall Junction Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Olen → Howard Quarries Inc; 1950-01-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Marshall Junction Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Marshall Junction Quarry; 1997-04-04 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1997-04-04 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Marshall Junction Quarry; 1998-02-03 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Marshall Junction Quarry; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc. → Marshall Junction Quarry; 2001-09-01 to 2010-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc.; 2001-09-01 to 2010-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Con-Agg Llc → Marshall Junction Quarry; 2001-12-28 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Marshall Junction Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Missouri, Inc → Marshall Junction Quarry; 2010-01-05 to 2016-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC-Missouri, Inc; 2010-01-05 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC-Missouri, Inc; 2010-01-05 to 2016-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Marshall Junction Quarry; 2010-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Marshall Junction Quarry; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc.; 2015-07-10 to 2010-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Con-Agg Companies, LLC → Marshall Junction Quarry; 2016-05-20 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Con-Agg Llc → Con-Agg Companies, LLC; 2016-05-20 to 2010-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Con-Agg Companies, LLC; 2016-05-20 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Marshall Junction Quarry; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-03-23 to current/open; source msha-controller-operator-history