# Relationship history for MSHA mine 3401809

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Sawyer East 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 → Sawyer East Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Products Inc → Sawyer East Quarry; 1998-07-01 to 2021-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Evelyn  Gillihan → Sawyer East Quarry; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evelyn  Gillihan → Rock Products Inc; 1998-07-01 to 2021-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Sawyer East Quarry; 2021-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2021-12-08 to current/open; source msha-controller-operator-history