# Relationship history for MSHA mine 3607802

Current hierarchy: **Kelley Frank Lewis → Flk Mining Company → Kelley #3**

- 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:** Kelley Frank Lewis → Kelley #3; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Flk Mining Company → Kelley #3; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelley Frank Lewis → Flk Mining Company; 1986-04-01 to current/open; source msha-controller-operator-history