# Relationship history for MSHA mine 2401988

Current hierarchy: **Ben  Houge → Spokane Minerals Limited → SPOKANE HILLS QUARRY**

- 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:** Spokane Minerals Limited → SPOKANE HILLS QUARRY; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ben  Houge → SPOKANE HILLS QUARRY; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben  Houge → Spokane Minerals Limited; 1993-03-01 to current/open; source msha-controller-operator-history