# Relationship history for MSHA mine 4300841

Current hierarchy: **John  Trombley → JOHN TROMBLEY CONSTRUCTION LLC → JOHN TROMBLEY MOBILE**

- 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:** John Trombley Construction LLC → JOHN TROMBLEY MOBILE; 2026-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Trombley → JOHN TROMBLEY MOBILE; 2026-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Trombley → John Trombley Construction LLC; 2026-04-16 to current/open; source msha-controller-operator-history