# Relationship history for MSHA mine 3608446

Current hierarchy: **Calypso Energy Holdings LLC → Pg & E Operating Services Company → Kaminski Bank #14**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pg & E Operating Services Company → Kaminski Bank #14; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U S Operating Services Holdings Inc → Kaminski Bank #14; 1994-07-01 to 2011-01-02; source msha-controller-operator-history
- **controller_controls_operator:** U S Operating Services Holdings Inc → Pg & E Operating Services Company; 1994-07-01 to 2011-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Calypso Energy Holdings LLC → Kaminski Bank #14; 2011-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calypso Energy Holdings LLC → Pg & E Operating Services Company; 2011-01-03 to current/open; source msha-controller-operator-history