# Relationship history for MSHA mine 1509991

Current hierarchy: **Faulkner Charles A → C B I Inc → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C B I Inc → No 1 Auger; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Faulkner Charles A → No 1 Auger; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Faulkner Charles A → C B I Inc; 1976-09-01 to current/open; source msha-controller-operator-history