# Relationship history for MSHA mine 4104159

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Southwest LLC → Black Spur 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 → Black Spur Quarry; 1998-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smyth Mines Llp → Black Spur Quarry; 2000-01-01 to 2002-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Fisher Sand & Gravel Co et al → Black Spur Quarry; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fisher Sand & Gravel Co et al → Smyth Mines Llp; 2000-01-01 to 2002-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Smyth Mines Inc et al → Smyth Mines Llp; 2000-01-01 to 2002-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Southwest, Ltd. → Black Spur Quarry; 2002-05-16 to 2007-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Southwest, Ltd.; 2002-05-16 to 2007-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Black Spur Quarry; 2007-11-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Southwest LLC → Black Spur Quarry; 2007-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Southwest LLC; 2007-12-03 to current/open; source msha-controller-operator-history