# Relationship history for MSHA mine 4104887

Current hierarchy: **Lynnwood E  Pierce → Lynnwood Pierce Stone Company → Pierce  Quarry #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:** Lynnwood Pierce Stone Company → Pierce  Quarry #2; 2011-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynnwood E  Pierce → Pierce  Quarry #2; 2011-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynnwood E  Pierce → Lynnwood Pierce Stone Company; 2011-05-23 to current/open; source msha-controller-operator-history