# Relationship history for MSHA mine 4201518

Current hierarchy: **Zufelt Lynn → Lynn Zufelt Mining → Yellow Circle No 2**

- 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:** Lynn Zufelt Mining → Yellow Circle No 2; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zufelt Lynn → Yellow Circle No 2; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zufelt Lynn → Lynn Zufelt Mining; 1978-03-09 to current/open; source msha-controller-operator-history