# Relationship history for MSHA mine 3603306

Current hierarchy: **Koch F → Panther Head Stripping Company → Panther Strip**

- 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:** Panther Head Stripping Company → Panther Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch F → Panther Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch F → Panther Head Stripping Company; 1950-01-01 to current/open; source msha-controller-operator-history