# Relationship history for MSHA mine 3101869

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc → CALDWELL 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 → CALDWELL QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Caldwell Stone Company Inc → CALDWELL QUARRY; 1979-01-01 to 1998-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Dale  Caldwell → CALDWELL QUARRY; 1979-01-01 to 1998-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Dale  Caldwell → Caldwell Stone Company Inc; 1979-01-01 to 1998-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → CALDWELL QUARRY; 1998-07-27 to 2005-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1998-07-27 to 2005-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc → CALDWELL QUARRY; 2005-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc; 2005-06-24 to current/open; source msha-controller-operator-history