# Relationship history for MSHA mine 5001437

Current hierarchy: **Parent D B Young D A & Dozette Michael → L & B Mining Company → Bear Creek Mine**

- 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:** L & B Mining Company → Bear Creek Mine; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parent D B Young D A & Dozette Michael → Bear Creek Mine; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parent D B Young D A & Dozette Michael → L & B Mining Company; 1982-08-01 to current/open; source msha-controller-operator-history