# Relationship history for MSHA mine 0203441

Current hierarchy: **C William  Nichols → Kilauea Crushers Inc. → The Ridge**

- 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:** C William  Nichols → The Ridge; 1989-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kilauea Crushers Inc. → The Ridge; 2021-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C William  Nichols → Kilauea Crushers Inc.; 2021-02-24 to current/open; source msha-controller-operator-history