# Relationship history for MSHA mine 3607078

Current hierarchy: **Merlo Charles J Jr → Alverda Resources Inc → Wherum Mine Site No 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

- **operator_operates_mine:** L & L Coal Company → Wherum Mine Site No 3; 1980-12-01 to 1981-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Luther Edward J & Fred Lehmier → Wherum Mine Site No 3; 1980-12-01 to 1981-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Luther Edward J & Fred Lehmier → L & L Coal Company; 1980-12-01 to 1981-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Alverda Resources Inc → Wherum Mine Site No 3; 1981-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merlo Charles J Jr → Wherum Mine Site No 3; 1981-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merlo Charles J Jr → Alverda Resources Inc; 1981-07-24 to current/open; source msha-controller-operator-history