# Relationship history for MSHA mine 3003191

Current hierarchy: **James E  Sheehan → J E Sheehan Contracting Company → PORTABLE PARKER PLANT**

- 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:** James E  Sheehan → PORTABLE PARKER PLANT; 1995-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J E Sheehan Contracting Company → PORTABLE PARKER PLANT; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Sheehan → J E Sheehan Contracting Company; 1997-05-01 to current/open; source msha-controller-operator-history