# Relationship history for MSHA mine 3304495

Current hierarchy: **W Thomas  Mackall → Sterling Mining Corporation → Carroll Hollow 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** W Thomas  Mackall et al → Carroll Hollow Mine; 1991-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Mining Corporation → Carroll Hollow Mine; 2002-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Thomas  Mackall et al → Sterling Mining Corporation; 2002-02-04 to current/open; source msha-controller-operator-history