# Relationship history for MSHA mine 1601375

Current hierarchy: **H E  Johnston Jr → B & M B Inc → DUDLEY PIT**

- 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:** H E  Johnston Jr → DUDLEY PIT; 1995-06-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & M B Inc → DUDLEY PIT; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H E  Johnston Jr → B & M B Inc; 2001-03-01 to current/open; source msha-controller-operator-history