# Relationship history for MSHA mine 0801071

Current hierarchy: **Sheltra Richard B → Sheltra & Son Construction Company Inc → Melear Pit**

- 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

- **controller_controls_mine:** Vecellio Group Inc → Melear Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ranger Construction Industries Inc → Melear Pit; 1987-05-01 to 1988-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Vecellio Group Inc → Ranger Construction Industries Inc; 1987-05-01 to 1988-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Sheltra & Son Construction Company Inc → Melear Pit; 1988-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sheltra Richard B → Melear Pit; 1988-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheltra Richard B → Sheltra & Son Construction Company Inc; 1988-03-04 to current/open; source msha-controller-operator-history