# Relationship history for MSHA mine 3401086

Current hierarchy: **C F & I Steel Corp → C F & I Steel Corp → Bokoshe Se**

- 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:** Crane Company → Bokoshe Se; 1950-01-01 to 1986-10-31; source msha-controller-operator-history
- **operator_operates_mine:** C F & I Steel Corp → Bokoshe Se; 1978-12-01 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → C F & I Steel Corp; 1978-12-01 to 1986-10-31; source msha-controller-operator-history
- **operator_operates_mine:** C F & I Steel Corp → Bokoshe Se; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C F & I Steel Corp → Bokoshe Se; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C F & I Steel Corp → C F & I Steel Corp; 1986-11-01 to current/open; source msha-controller-operator-history