# Relationship history for MSHA mine 4603319

Current hierarchy: **Bibbee Charles C → Venblack Inc → Austin Black Plant**

- 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:** Slab Fork Coal Company → Austin Black Plant; 1950-01-01 to 1984-02-21; source msha-controller-operator-history
- **controller_controls_mine:** S Austin  Caperton III → Austin Black Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S Austin  Caperton III → Slab Fork Coal Company; 1950-01-01 to 1984-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Ven Black Inc → Austin Black Plant; 1984-02-22 to 1984-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Keagy Barry → Austin Black Plant; 1984-02-22 to 1984-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Keagy Barry → Ven Black Inc; 1984-02-22 to 1984-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Venblack Inc → Austin Black Plant; 1984-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bibbee Charles C → Austin Black Plant; 1984-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bibbee Charles C → Venblack Inc; 1984-12-03 to current/open; source msha-controller-operator-history