# Relationship history for MSHA mine 3607825

Current hierarchy: **Lehman Marlin D Jr-Adam Haldeman → H L & W Coal Company → Hl&W 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:** H L & W Coal Company → Hl&W Slope; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lehman Marlin D Jr-Adam Haldeman Et Al → Hl&W Slope; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lehman Marlin D Jr-Adam Haldeman Et Al → H L & W Coal Company; 1986-08-01 to current/open; source msha-controller-operator-history