# Relationship history for MSHA mine 0503821

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials → FOUNTAIN PIT**

- 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 → FOUNTAIN PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → FOUNTAIN PIT; 1980-11-15 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Broderick & Gibbons Inc → FOUNTAIN PIT; 1982-11-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Broderick & Gibbons Inc; 1982-11-01 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Southern Inc → FOUNTAIN PIT; 1988-11-14 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → FOUNTAIN PIT; 1988-11-14 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Mobile Southern Inc; 1988-11-14 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Southern Inc → FOUNTAIN PIT; 1998-02-11 to 2002-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → FOUNTAIN PIT; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Southern Inc; 1998-02-11 to 2002-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West  Incorporated → FOUNTAIN PIT; 2002-01-31 to 2011-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → FOUNTAIN PIT; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West  Incorporated; 2002-01-31 to 2011-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → FOUNTAIN PIT; 2011-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2011-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → FOUNTAIN PIT; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West  Incorporated; 2015-07-10 to 2011-12-20; source msha-controller-operator-history