# Relationship history for MSHA mine 1300014

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → AMES MINE**

- 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 → AMES MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E I Sargent Quarries Inc → AMES MINE; 1950-01-01 to 1982-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Sargent → AMES MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Sargent → E I Sargent Quarries Inc; 1950-01-01 to 1982-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → AMES MINE; 1982-04-26 to 2003-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1982-04-26 to 2003-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → AMES MINE; 2003-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2003-02-01 to current/open; source msha-controller-operator-history