# Relationship history for MSHA mine 4608673

Current hierarchy: **Carl  Blevins → Cf & B Coal Works Inc → Turnhole Branch #1**

- 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:** Carmen  D'Angelo → Turnhole Branch #1; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Blevins → Turnhole Branch #1; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Cave Inc → Turnhole Branch #1; 1997-10-01 to 1999-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Carmen  D'Angelo → Coal Cave Inc; 1997-10-01 to 1999-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Cf & B Coal Works Inc → Turnhole Branch #1; 1999-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Blevins → Cf & B Coal Works Inc; 1999-07-02 to current/open; source msha-controller-operator-history