# Relationship history for MSHA mine 3608583

Current hierarchy: **Alvin E  Naugle Jr → L M M Inc → Billy Strip Mine Snyder Pit 5 & 6**

- 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 M M Inc → Billy Strip Mine Snyder Pit 5 & 6; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvin E  Naugle Jr → Billy Strip Mine Snyder Pit 5 & 6; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvin E  Naugle Jr → L M M Inc; 1996-09-01 to current/open; source msha-controller-operator-history