# Relationship history for MSHA mine 1518680

Current hierarchy: **John  Asher → Asher Quality Coal Corp → #2**

- 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

- **controller_controls_mine:** John  Asher  et al → #2; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Asher Quality Coal Corp → #2; 2003-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Asher  et al → Asher Quality Coal Corp; 2003-10-29 to current/open; source msha-controller-operator-history