# Relationship history for MSHA mine 4405654

Current hierarchy: **Noah B  Lambert → Nbl Coal Company Inc → #1**

- 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:** Dennis B  Sutherland et al → #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lambert Coal Company Inc → #1; 1981-05-01 to 1991-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Dennis B  Sutherland et al → Lambert Coal Company Inc; 1981-05-01 to 1991-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Arlie J  Lambert et al → Lambert Coal Company Inc; 1981-05-01 to 1991-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Nbl Coal Company Inc → #1; 1991-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Noah B  Lambert → #1; 1991-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Noah B  Lambert → Nbl Coal Company Inc; 1991-12-11 to current/open; source msha-controller-operator-history