# Relationship history for MSHA mine 0503263

Current hierarchy: **Smith Allen B & Charles Fedler → Allen B Smith & Charles Fedler → A Q #1**

- 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:** Unaweep Minerals → A Q #1; 1978-12-01 to 1982-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Thornburg Kregg → A Q #1; 1978-12-01 to 1982-11-11; source msha-controller-operator-history
- **controller_controls_operator:** Thornburg Kregg → Unaweep Minerals; 1978-12-01 to 1982-11-11; source msha-controller-operator-history
- **operator_operates_mine:** Allen B Smith & Charles Fedler → A Q #1; 1982-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Allen B & Charles Fedler → A Q #1; 1982-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Allen B & Charles Fedler → Allen B Smith & Charles Fedler; 1982-11-12 to current/open; source msha-controller-operator-history