# Relationship history for MSHA mine 2601855

Current hierarchy: **Brown James R & Henry Hiel → Tseng Mining Company → Como 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:** Brown James R & Henry Hiel → Como Mine; 1982-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tseng Mining Company → Como Mine; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown James R & Henry Hiel → Tseng Mining Company; 1983-07-01 to current/open; source msha-controller-operator-history