# Relationship history for MSHA mine 4403174

Current hierarchy: **Arlie J  Lambert; Dennis B  Sutherland → Lambert Coal Company Inc → No 40**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Griffon Coal Company → No 40; 1950-01-01 to 1974-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Griffon Coal Co → No 40; 1950-01-01 to 1974-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Griffon Coal Co → Griffon Coal Company; 1950-01-01 to 1974-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Arlie J  Lambert et al → No 40; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lambert Coal Company Inc → No 40; 1974-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arlie J  Lambert et al → Lambert Coal Company Inc; 1974-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis B  Sutherland et al → Lambert Coal Company Inc; 1974-02-20 to current/open; source msha-controller-operator-history