# Relationship history for MSHA mine 3609223

Current hierarchy: **Stephen  Walter → Stephen Walter → R. P. M. 1 & 2 Stone**

- 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:** Rodney P  Martin → R. P. M. 1 & 2 Stone; 2003-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R. P. M. 1 & 2 Stone Company → R. P. M. 1 & 2 Stone; 2004-01-01 to 2005-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Rodney P  Martin → R. P. M. 1 & 2 Stone Company; 2004-01-01 to 2005-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Stephen Walter → R. P. M. 1 & 2 Stone; 2005-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Walter → R. P. M. 1 & 2 Stone; 2005-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Walter → Stephen Walter; 2005-06-23 to current/open; source msha-controller-operator-history