# Relationship history for MSHA mine 4700180

Current hierarchy: **Blair E  Dillman → Quality Stone Inc → Quality Stone 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:** Loren J Slaght → Quality Stone Quarry; 1950-01-01 to 1982-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Slaght Loren J → Quality Stone Quarry; 1950-01-01 to 1983-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Slaght Loren J → Loren J Slaght; 1950-01-01 to 1982-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Blair E  Dillman → Quality Stone Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Stone Inc → Quality Stone Quarry; 1982-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair E  Dillman → Quality Stone Inc; 1982-10-29 to current/open; source msha-controller-operator-history