# Relationship history for MSHA mine 4003475

Current hierarchy: **Walter E  Tollett → Tollett Stone → Tollett # 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

- **controller_controls_mine:** Walter E  Tollett → Tollett # 2; 2011-07-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tollett Stone → Tollett # 2; 2017-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter E  Tollett → Tollett Stone; 2017-05-08 to current/open; source msha-controller-operator-history