# Relationship history for MSHA mine 0202566

Current hierarchy: **Marlene M  Ashton; Lawrence  Ashton → Southern Arizona Paving & Construction Company → AZTEC ROCK & ASPHALT**

- 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:** Lawrence E  Ashton et al → AZTEC ROCK & ASPHALT; 1950-01-01 to 2017-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Ashton Company Inc → AZTEC ROCK & ASPHALT; 1992-01-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence E  Ashton et al → Ashton Company Inc; 1992-01-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Harold W  Ashton et al → Ashton Company Inc; 1992-01-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Cindy L  Ashton et al → Ashton Company Inc; 1992-01-01 to 1997-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Southern Arizona Paving & Construction Company → AZTEC ROCK & ASPHALT; 1997-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marlene M  Ashton → AZTEC ROCK & ASPHALT; 1997-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marlene M  Ashton → Southern Arizona Paving & Construction Company; 1997-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Ashton → Southern Arizona Paving & Construction Company; 1997-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry E  Ashton et al → AZTEC ROCK & ASPHALT; 2017-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry E  Ashton et al → Ashton Company Inc; 2017-12-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Nena  Ashton et al → Ashton Company Inc; 2017-12-01 to 1997-05-29; source msha-controller-operator-history