# Relationship history for MSHA mine 4403506

Current hierarchy: **Noah B  Lambert → Oliver Coal Company Inc → #2**

- 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:** Oliver Coal Company → #2; 1950-01-01 to 1984-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Noah B & Oliver Kendrick Jr → #2; 1950-01-01 to 1984-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Noah B & Oliver Kendrick Jr → Oliver Coal Company; 1950-01-01 to 1984-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Oliver Coal Company Inc → #2; 1984-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Noah B  Lambert → #2; 1984-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Noah B  Lambert → Oliver Coal Company Inc; 1984-06-19 to current/open; source msha-controller-operator-history