# Relationship history for MSHA mine 3606649

Current hierarchy: **Lenig Lamar → K & L Coal Company → No 1 Slope**

- 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:** K & L Coal Company → No 1 Slope; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lenig Lamar Et Al → No 1 Slope; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lenig Lamar Et Al → K & L Coal Company; 1978-01-01 to current/open; source msha-controller-operator-history