# Relationship history for MSHA mine 3000062

Current hierarchy: **Peter B  Johnston Sr. → Johnston & Rhodes Bluestone Company → Reynolds Quarry-East Branch Quarry & Mil**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Johnston & Rhodes Bluestone Company → Reynolds Quarry-East Branch Quarry & Mil; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter B  Johnston Sr. → Reynolds Quarry-East Branch Quarry & Mil; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter B  Johnston Sr. → Johnston & Rhodes Bluestone Company; 1950-01-01 to current/open; source msha-controller-operator-history