# Relationship history for MSHA mine 3609628

Current hierarchy: **Targe Energy LLC → BEDROCK MINES LP → SCHRECKENGOST MINE**

- 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

- **controller_controls_mine:** William B  Spence → SCHRECKENGOST MINE; 2005-07-28 to 2019-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Bedrock Mines LP → SCHRECKENGOST MINE; 2008-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Spence → Bedrock Mines LP; 2008-09-02 to 2019-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Targe Energy LLC → SCHRECKENGOST MINE; 2019-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Targe Energy LLC → Bedrock Mines LP; 2019-10-09 to current/open; source msha-controller-operator-history