# Relationship history for MSHA mine 1508534

Current hierarchy: **Quality State Coal & Earthco Enterprises → Yamacraw Fuel → Yamacraw Fuel Mine #3**

- 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:** Quality State Coal Company → Yamacraw Fuel Mine #3; 1975-07-18 to 1980-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Clevenger Jimmy → Yamacraw Fuel Mine #3; 1975-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clevenger Jimmy → Quality State Coal Company; 1975-07-18 to 1980-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Yamacraw Fuel → Yamacraw Fuel Mine #3; 1980-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quality State Coal & Earthco Enterprises → Yamacraw Fuel Mine #3; 1980-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quality State Coal & Earthco Enterprises → Yamacraw Fuel; 1980-03-26 to current/open; source msha-controller-operator-history