# Relationship history for MSHA mine 2600803

Current hierarchy: **Teichert Inc → Western Nevada Materials → Spanish Springs 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → Spanish Springs Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seaberry-Depaoli Construction Company Inc → Spanish Springs Quarry; 1950-01-01 to 1986-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Fred F  Depaoli → Spanish Springs Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred F  Depaoli → Seaberry-Depaoli Construction Company Inc; 1950-01-01 to 1986-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Ridge Inc → Spanish Springs Quarry; 1986-11-10 to 2001-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Kelly  Shane et al → Spanish Springs Quarry; 1986-11-10 to 2001-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Kelly  Shane et al → Rocky Ridge Inc; 1986-11-10 to 2001-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc → Spanish Springs Quarry; 2001-08-10 to 2003-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc; 2001-08-10 to 2003-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Ridge, Inc → Spanish Springs Quarry; 2003-10-29 to 2005-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Spanish Springs Quarry; 2003-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Rocky Ridge, Inc; 2003-10-29 to 2005-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Spanish Springs Quarry; 2005-05-19 to 2021-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-05-19 to 2021-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Teichert Inc → Spanish Springs Quarry; 2017-12-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Nevada Materials → Spanish Springs Quarry; 2021-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teichert Inc → Western Nevada Materials; 2021-02-09 to current/open; source msha-controller-operator-history