# Relationship history for MSHA mine 3609101

Current hierarchy: **Peter B  Johnston Sr. → Johnston & Rhodes Bluestone Co. → Peterson Quarry**

- 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:** Peter B  Johnston Sr. → Peterson Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Mirch → Peterson Quarry; 2002-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tompkins Bluestone Co., Inc. → Peterson Quarry; 2002-06-10 to 2004-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Mirch → Tompkins Bluestone Co., Inc.; 2002-06-10 to 2004-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Ben Ralston → Peterson Quarry; 2004-03-25 to 2010-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Ben J  Ralston → Peterson Quarry; 2004-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben J  Ralston → Ben Ralston; 2004-03-25 to 2010-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Johnston & Rhodes Bluestone Co. → Peterson Quarry; 2010-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter B  Johnston Sr. → Johnston & Rhodes Bluestone Co.; 2010-04-06 to current/open; source msha-controller-operator-history