# Relationship history for MSHA mine 4102383

Current hierarchy: **Ranger Excavating Inc → M E Ruby Jr Inc → Allen Pit & Plant**

- 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:** M E Ruby Jr Inc → Allen Pit & Plant; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_mine:** M E  Ruby → Allen Pit & Plant; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **controller_controls_operator:** M E  Ruby → M E Ruby Jr Inc; 1950-01-01 to 1996-04-30; source msha-controller-operator-history
- **operator_operates_mine:** M E Ruby Jr Inc → Allen Pit & Plant; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ranger Excavating Inc → Allen Pit & Plant; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ranger Excavating Inc → M E Ruby Jr Inc; 1996-05-01 to current/open; source msha-controller-operator-history