# Relationship history for MSHA mine 1519779

Current hierarchy: **Bennett  Grocock → ACPKY1, LLC → Steele Hollow Mine**

- 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:** Bennett  Grocock et al → Steele Hollow Mine; 2014-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ACPKY1, LLC → Steele Hollow Mine; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennett  Grocock et al → ACPKY1, LLC; 2015-05-08 to current/open; source msha-controller-operator-history