# Relationship history for MSHA mine 0900436

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → AUBURN 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 → AUBURN QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Stone Company → AUBURN QUARRY; 1950-01-01 to 1980-04-29; source msha-controller-operator-history
- **controller_controls_mine:** John  Johnson → AUBURN QUARRY; 1950-01-01 to 1980-04-29; source msha-controller-operator-history
- **controller_controls_operator:** John  Johnson → Johnson Stone Company; 1950-01-01 to 1980-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Barrow Stone Company → AUBURN QUARRY; 1980-04-30 to 1984-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Logan W Truman → AUBURN QUARRY; 1980-04-30 to 1984-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Logan W Truman → Barrow Stone Company; 1980-04-30 to 1984-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Barrow Gwinnett Stone Company → AUBURN QUARRY; 1984-04-15 to 1991-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Whyte Maurice & Susan → AUBURN QUARRY; 1984-04-15 to 1991-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Whyte Maurice & Susan → Barrow Gwinnett Stone Company; 1984-04-15 to 1991-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → AUBURN QUARRY; 1991-06-21 to 2005-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1991-06-21 to 2005-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → AUBURN QUARRY; 2005-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-06-30 to current/open; source msha-controller-operator-history