# Relationship history for MSHA mine 0501817

Current hierarchy: **EMSU LLC → Nuvemco LLC → Blackburn Mine/Monogram Jo Dandy**

- 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 → Blackburn Mine/Monogram Jo Dandy; 1950-01-01 to 2009-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → Blackburn Mine/Monogram Jo Dandy; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Union Carbide Corp; 1950-01-01 to 2009-03-08; source msha-controller-operator-history
- **controller_controls_mine:** EMSU LLC et al → Blackburn Mine/Monogram Jo Dandy; 2007-04-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nuvemco LLC → Blackburn Mine/Monogram Jo Dandy; 2009-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EMSU LLC et al → Nuvemco LLC; 2009-03-09 to current/open; source msha-controller-operator-history