# Relationship history for MSHA mine 3001664

Current hierarchy: **Northeast Slate Incorporated → HILLTOP SLATE INC → RED QUARRY**

- 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:** Hilltop Slate Company → RED QUARRY; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Everest T  Tatko Et Al → RED QUARRY; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Everest T  Tatko Et Al → Hilltop Slate Company; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → RED QUARRY; 1986-03-04 to 2008-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Hilltop Slate Inc → RED QUARRY; 1986-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → Hilltop Slate Inc; 1986-03-06 to 2008-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Northeast Slate Incorporated → RED QUARRY; 2008-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Northeast Slate Incorporated → Hilltop Slate Inc; 2008-01-16 to current/open; source msha-controller-operator-history