# Relationship history for MSHA mine 1301702

Current hierarchy: **Daniel Ryan  Roberts → Douds Stone, LLC → Crew Four (4)**

- 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

- **operator_operates_mine:** Martin Marietta Aggregates → Crew Four (4); 1950-01-01 to 2002-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Crew Four (4); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1950-01-01 to 2002-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Yates → Crew Four (4); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Douds Stone, Inc. → Crew Four (4); 2002-08-05 to 2012-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Yates → Douds Stone, Inc.; 2002-08-05 to 2012-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Douds Stone, LLC → Crew Four (4); 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brady D  Meldrem → Crew Four (4); 2012-12-01 to 2018-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Brady D  Meldrem → Douds Stone, LLC; 2012-12-01 to 2018-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Ryan  Roberts → Crew Four (4); 2018-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Ryan  Roberts → Douds Stone, LLC; 2018-10-19 to current/open; source msha-controller-operator-history