# Relationship history for MSHA mine 1519428

Current hierarchy: **John  Asher → Asher's Quality Coal Corporation → Mine #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

- **controller_controls_mine:** John  Asher  et al → Mine #1; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Asher's Quality Coal Corporation → Mine #1; 2009-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Asher  et al → Asher's Quality Coal Corporation; 2009-08-24 to current/open; source msha-controller-operator-history