# Relationship history for MSHA mine 2602139

Current hierarchy: **Melvin D  Clark → Mel Clark Inc. → Mel Clark 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pipes Paving Inc → Mel Clark Inc.; 1990-01-01 to 2010-05-20; source msha-controller-operator-history
- **controller_controls_mine:** William  Pipes → Mel Clark Inc.; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Pipes → Pipes Paving Inc; 1990-01-01 to 2010-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Melvin D  Clark → Mel Clark Inc.; 1999-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mel Clark Inc. → Mel Clark Inc.; 2010-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melvin D  Clark → Mel Clark Inc.; 2010-05-21 to current/open; source msha-controller-operator-history