# Relationship history for MSHA mine 3304465

Current hierarchy: **Mark B  Stark → Nelson Stark Company → UNI-BILT**

- 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:** Mark B  Stark → UNI-BILT; 1992-08-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Stark Company → UNI-BILT; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark B  Stark → Nelson Stark Company; 2000-08-01 to current/open; source msha-controller-operator-history