# Relationship history for MSHA mine 1518531

Current hierarchy: **Susan  Branham → M & D Pipeline, Inc. → Stratton Branch**

- 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:** Ocie A  May → Stratton Branch; 2001-09-21 to 2003-07-13; source msha-controller-operator-history
- **operator_operates_mine:** M & D Pipeline, Inc. → Stratton Branch; 2002-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ocie A  May → M & D Pipeline, Inc.; 2002-03-21 to 2003-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Branham → Stratton Branch; 2003-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Branham → M & D Pipeline, Inc.; 2003-07-14 to current/open; source msha-controller-operator-history