# Relationship history for MSHA mine 2301963

Current hierarchy: **Darla C  Overstreet → Dry Creek  Materials, Inc. → Dry Creek  Materials,  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:** Dry Creek Sand & Gravel → Dry Creek  Materials,  Inc.; 1987-05-01 to 1988-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Reese → Dry Creek  Materials,  Inc.; 1987-05-01 to 1988-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Reese → Dry Creek Sand & Gravel; 1987-05-01 to 1988-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Dry Creek Sand & Gravel → Dry Creek  Materials,  Inc.; 1988-04-26 to 2004-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Walden G  Moore → Dry Creek  Materials,  Inc.; 1988-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walden G  Moore → Dry Creek Sand & Gravel; 1988-04-26 to 2004-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Dry Creek  Materials, Inc. → Dry Creek  Materials,  Inc.; 2004-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darla C  Overstreet → Dry Creek  Materials,  Inc.; 2004-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darla C  Overstreet → Dry Creek  Materials, Inc.; 2004-07-22 to current/open; source msha-controller-operator-history