# Relationship history for MSHA mine 3605083

Current hierarchy: **Kiefer Terry P → Terry P Kiefer Coal Company → Kiefer 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:** Terry P Kiefer Coal Company → Kiefer Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kiefer Terry P → Kiefer Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiefer Terry P → Terry P Kiefer Coal Company; 1974-01-01 to current/open; source msha-controller-operator-history