# Relationship history for MSHA mine 4608722

Current hierarchy: **David C  DeBarr → Ritchie Stone Inc → RITCHIE STONE INC.**

- 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

- **operator_operates_mine:** Ritchie Stone Inc → RITCHIE STONE INC.; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David C  DeBarr → RITCHIE STONE INC.; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  DeBarr → Ritchie Stone Inc; 1998-06-01 to current/open; source msha-controller-operator-history