# Relationship history for MSHA mine 3601074

Current hierarchy: **Fisher C A → Fisher Coal Company → Kathryn**

- 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:** Fisher Coal Company → Kathryn; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fisher C A → Kathryn; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fisher C A → Fisher Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history