# Relationship history for MSHA mine 1300125

Current hierarchy: **Quikrete Holdings Inc. → Continental Cement Company, LLC → Davenport Plant**

- 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:** Martin Marietta Cement → Davenport Plant; 1950-01-01 to 1983-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Davenport Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Cement; 1950-01-01 to 1983-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Davenport Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Davenport Plant; 1983-05-23 to 2002-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1983-05-23 to 2002-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Continental Cement Holding Company → Davenport Plant; 1996-06-21 to 2011-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Davenport Plant; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America → Davenport Plant; 2002-12-03 to 2015-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America; 2002-12-03 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Davenport Plant; 2011-05-31 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Davenport Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America; 2015-07-10 to 2015-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Continental Cement Company, LLC → Davenport Plant; 2015-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Continental Cement Company, LLC; 2015-07-18 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Continental Cement Holding Company → Continental Cement Company, LLC; 2015-07-18 to 2011-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → Davenport Plant; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Continental Cement Company, LLC; 2025-02-10 to current/open; source msha-controller-operator-history