# Relationship history for MSHA mine 3609052

Current hierarchy: **Calypso Energy Holdings LLC → U. S. Operating Services Company → Hazleton Site**

- 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:** U S Operating Services Holdings Inc → Hazleton Site; 1994-07-01 to 2011-01-02; source msha-controller-operator-history
- **operator_operates_mine:** U. S. Operating Services Company → Hazleton Site; 2001-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Operating Services Holdings Inc → U. S. Operating Services Company; 2001-12-04 to 2011-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Calypso Energy Holdings LLC → Hazleton Site; 2011-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calypso Energy Holdings LLC → U. S. Operating Services Company; 2011-01-03 to current/open; source msha-controller-operator-history