# Relationship history for MSHA mine 1512533

Current hierarchy: **Justice Muncy & Gwen Joyce → J & M Coal Company → No 1 Surface**

- 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:** J & M Coal Company → No 1 Surface; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justice Muncy & Gwen Joyce → No 1 Surface; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justice Muncy & Gwen Joyce → J & M Coal Company; 1980-08-01 to current/open; source msha-controller-operator-history