# Relationship history for MSHA mine 4501387

Current hierarchy: **Albert E  DeAtley → Basin Asphalt Company → Basin Asphalt 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:** S & D Paving Company → Basin Asphalt Pit; 1950-01-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Smith Edward → Basin Asphalt Pit; 1950-01-01 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Smith Edward → S & D Paving Company; 1950-01-01 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Basin Asphalt Company → Basin Asphalt Pit; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert E  DeAtley → Basin Asphalt Pit; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert E  DeAtley → Basin Asphalt Company; 1981-01-01 to current/open; source msha-controller-operator-history