# Relationship history for MSHA mine 1513124

Current hierarchy: **Hill Ray--Dencil Campbell → Whetstone Mining Incorp → Whetstone No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Whetstone Mining Incorp → Whetstone No 1 Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hill Ray--Dencil Campbell Et Al → Whetstone No 1 Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill Ray--Dencil Campbell Et Al → Whetstone Mining Incorp; 1981-05-01 to current/open; source msha-controller-operator-history