# Relationship history for MSHA mine 3303988

Current hierarchy: **James R  Demuth → ENZ, INC. → Sickafoose 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:** Leland  Ervin et al → Sickafoose Mine; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Enz Inc → Sickafoose Mine; 1984-10-01 to 1991-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Leland  Ervin et al → Enz Inc; 1984-10-01 to 1991-03-14; source msha-controller-operator-history
- **operator_operates_mine:** ENZ, INC. → Sickafoose Mine; 1991-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James R  Demuth et al → Sickafoose Mine; 1991-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Demuth et al → ENZ, INC.; 1991-03-15 to current/open; source msha-controller-operator-history