# Relationship history for MSHA mine 4605475

Current hierarchy: **Vincent Robert E → R V & B Coal Company Inc → No 1 Mine**

- 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:** Rag Aktiengesellschaft → No 1 Mine; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp → No 1 Mine; 1977-05-01 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Energy Development Corp; 1977-05-01 to 1980-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Glen Alum Mining Company → No 1 Mine; 1980-01-18 to 1981-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Toler Larlis & Marcial--Larry Browning → No 1 Mine; 1980-01-18 to 1981-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Toler Larlis & Marcial--Larry Browning → Glen Alum Mining Company; 1980-01-18 to 1981-08-07; source msha-controller-operator-history
- **operator_operates_mine:** R V & B Coal Company Inc → No 1 Mine; 1981-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vincent Robert E → No 1 Mine; 1981-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent Robert E → R V & B Coal Company Inc; 1981-08-08 to current/open; source msha-controller-operator-history