# Relationship history for MSHA mine 1800009

Current hierarchy: **Martin Marietta Materials Inc → Bluegrass Materials Company, LLC → Texas 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:** Flintkote Stone Products Company → Texas Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → Texas Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Stone Products Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Texas Quarry; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → Texas Quarry; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Redland Genstar Inc → Texas Quarry; 1986-11-04 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Texas Quarry; 1986-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Redland Genstar Inc; 1986-11-04 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Mid-Atlantic, Inc. → Texas Quarry; 1998-02-11 to 2009-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Texas Quarry; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Mid-Atlantic, Inc.; 1998-02-11 to 2009-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Texas Quarry; 2009-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Mid-Atlantic, LLC → Texas Quarry; 2009-05-05 to 2014-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Mid-Atlantic, LLC; 2009-05-05 to 2014-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Panadero Aggregates Holdings, LLC → Texas Quarry; 2010-08-26 to 2018-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Bluegrass Materials Company, LLC → Texas Quarry; 2014-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Panadero Aggregates Holdings, LLC → Bluegrass Materials Company, LLC; 2014-02-13 to 2018-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Texas Quarry; 2018-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Bluegrass Materials Company, LLC; 2018-04-27 to current/open; source msha-controller-operator-history