# Relationship history for MSHA mine 0504986

Current hierarchy: **Robert C  Willits → WILLITS COMPANY, INC. → ALMA PLANT**

- 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:** Robert C  Willits → ALMA PLANT; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** WILLITS COMPANY, INC. → ALMA PLANT; 2011-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Willits → WILLITS COMPANY, INC.; 2011-06-16 to current/open; source msha-controller-operator-history