# Relationship history for MSHA mine 4406105

Current hierarchy: **Potter David L → Little Beaver Drilling Company → No 1 Auger**

- 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:** Little Beaver Drilling Company → No 1 Auger; 1984-06-01 to 1987-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Potter James E & David L → No 1 Auger; 1984-06-01 to 1987-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Potter James E & David L → Little Beaver Drilling Company; 1984-06-01 to 1987-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Potter David L → No 1 Auger; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Beaver Drilling Company → No 1 Auger; 1987-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter David L → Little Beaver Drilling Company; 1987-01-16 to current/open; source msha-controller-operator-history