# Relationship history for MSHA mine 3609104

Current hierarchy: **Richard  Mirch → Tompkins Bluestone Co., Inc. → Hidden Valley**

- 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:** Richard  Mirch → Hidden Valley; 2002-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tompkins Bluestone Co., Inc. → Hidden Valley; 2002-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Mirch → Tompkins Bluestone Co., Inc.; 2002-06-10 to current/open; source msha-controller-operator-history