# Relationship history for MSHA mine 1302051

Current hierarchy: **Daniel Ryan  Roberts → Douds Stone LLC → CREW THREE**

- 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 → CREW THREE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Yates → CREW THREE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kaser Corporation et al → CREW THREE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kaser Corp → CREW THREE; 1985-05-01 to 1997-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Kaser Corporation et al → Kaser Corp; 1985-05-01 to 1997-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc et al → Kaser Corp; 1985-05-01 to 1997-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → CREW THREE; 1997-09-05 to 2002-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1997-09-05 to 2002-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Douds Stone, Inc. → CREW THREE; 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 THREE; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brady D  Meldrem → CREW THREE; 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 THREE; 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