# Relationship history for MSHA mine 2300043

Current hierarchy: **BMC Enterprises Inc → BMC Stone, LLC → DEFIANCE 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:** Defiance Quarry Company → DEFIANCE QUARRY; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Edwin A  Kurtz → DEFIANCE QUARRY; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Edwin A  Kurtz → Defiance Quarry Company; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Construction Materials → DEFIANCE QUARRY; 1987-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → DEFIANCE QUARRY; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Construction Materials; 1987-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → DEFIANCE QUARRY; 1998-02-03 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → DEFIANCE QUARRY; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc → DEFIANCE QUARRY; 2001-09-17 to 2010-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc; 2001-09-17 to 2010-01-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → DEFIANCE QUARRY; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC-Missouri, Inc → DEFIANCE QUARRY; 2010-01-05 to 2014-11-03; 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 2014-11-03; source msha-controller-operator-history
- **operator_operates_mine:** BMC Stone, LLC → DEFIANCE QUARRY; 2014-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BMC Enterprises Inc → DEFIANCE QUARRY; 2014-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BMC Enterprises Inc → BMC Stone, LLC; 2014-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → DEFIANCE 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