# Relationship history for MSHA mine 1516500

Current hierarchy: **Baker Ralph → Cranks Mining Corp → #1 Strip & Auger**

- 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

- **operator_operates_mine:** Cranks Mining Corp → #1 Strip & Auger; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Baker Ralph → #1 Strip & Auger; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Ralph → Cranks Mining Corp; 1988-10-01 to current/open; source msha-controller-operator-history