# Relationship history for MSHA mine 4601859

Current hierarchy: **Union Carbide Corp → Union Carbide Corp-Metals Division → Morris Fork No 5b**

- 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:** Union Carbide Corp-Metals Division → Morris Fork No 5b; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → Morris Fork No 5b; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Union Carbide Corp-Metals Division; 1950-01-01 to current/open; source msha-controller-operator-history