# Relationship history for MSHA mine 2700380

Current hierarchy: **Ernest J  Thibeault III → THIBEAULT CORPORATION OF N.E → PORTABLE CRUSHER**

- 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:** Ernest J  Thibeault III → PORTABLE CRUSHER; 1997-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** THIBEAULT CORPORATION OF N.E → PORTABLE CRUSHER; 2002-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest J  Thibeault III → THIBEAULT CORPORATION OF N.E; 2002-11-04 to current/open; source msha-controller-operator-history