# Relationship history for MSHA mine 0201890

Current hierarchy: **Nena  Ashton; Larry E  Ashton → Ashton Company Inc → Avra Valley Pit**

- 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:** Tanner Companies → Avra Valley Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence E  Ashton et al → Avra Valley Pit; 1950-01-01 to 2017-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Skousen W R → Avra Valley Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ashton Company Inc → Avra Valley Pit; 1978-03-09 to 1979-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence E  Ashton et al → Ashton Company Inc; 1978-03-09 to 1979-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Cindy L  Ashton et al → Ashton Company Inc; 1978-03-09 to 1979-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Harold W  Ashton et al → Ashton Company Inc; 1978-03-09 to 1979-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Tanner Companies → Avra Valley Pit; 1979-03-20 to 1980-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Tanner Companies → Tanner Companies; 1979-03-20 to 1980-01-20; source msha-controller-operator-history
- **operator_operates_mine:** W R Skousen Contractor Inc → Avra Valley Pit; 1980-01-21 to 1980-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Skousen W R → W R Skousen Contractor Inc; 1980-01-21 to 1980-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Ashton Company Inc → Avra Valley Pit; 1980-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence E  Ashton et al → Ashton Company Inc; 1980-05-21 to 2017-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Cindy L  Ashton et al → Ashton Company Inc; 1980-05-21 to 2017-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Harold W  Ashton et al → Ashton Company Inc; 1980-05-21 to 2017-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Nena  Ashton et al → Avra Valley Pit; 2017-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nena  Ashton et al → Ashton Company Inc; 2017-12-01 to 1979-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Larry E  Ashton et al → Ashton Company Inc; 2017-12-01 to 1979-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Nena  Ashton et al → Ashton Company Inc; 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 current/open; source msha-controller-operator-history