# Relationship history for MSHA mine 1519443

Current hierarchy: **Myron G.  McCoy → Engle Hollow Mining LLC → Gem No 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:** Myron G.  McCoy → Gem No 1; 2009-08-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Engle Hollow Mining LLC → Gem No 1; 2009-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Myron G.  McCoy → Engle Hollow Mining LLC; 2009-11-05 to current/open; source msha-controller-operator-history