# Relationship history for MSHA mine 2900422

Current hierarchy: **Gregg K  Price → Asphalt Paving Company → La Plata 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

- **operator_operates_mine:** Asphalt Paving Company Inc → La Plata Pit; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Jensen William M → La Plata Pit; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jensen William M → Asphalt Paving Company Inc; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ray L Atchison Construction Company Inc → La Plata Pit; 1987-01-01 to 1991-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Atchison Ray L → La Plata Pit; 1987-01-01 to 1991-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Atchison Ray L → Ray L Atchison Construction Company Inc; 1987-01-01 to 1991-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Asphalt Paving Company → La Plata Pit; 1991-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregg K  Price → La Plata Pit; 1991-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregg K  Price → Asphalt Paving Company; 1991-07-09 to current/open; source msha-controller-operator-history