# Relationship history for MSHA mine 1201611

Current hierarchy: **Bender Jim → B & B Coal Company Inc → Mine No 231**

- 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:** Electra Coal Corp → Mine No 231; 1977-10-01 to 1978-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Verne → Mine No 231; 1977-10-01 to 1978-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Verne → Electra Coal Corp; 1977-10-01 to 1978-03-13; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company Inc → Mine No 231; 1978-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bender Jim → Mine No 231; 1978-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bender Jim → B & B Coal Company Inc; 1978-03-14 to current/open; source msha-controller-operator-history