# Relationship history for MSHA mine 4300019

Current hierarchy: **Northeast Slate Incorporated → HILLTOP SLATE INC → HIGH RD 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:** Rising & Nelson Slate Company Inc → HIGH RD QUARRY; 1950-01-01 to 1986-01-21; source msha-controller-operator-history
- **controller_controls_mine:** James M  Mertz → HIGH RD QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M  Mertz → Rising & Nelson Slate Company Inc; 1950-01-01 to 1986-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Rupe Slate Company → HIGH RD QUARRY; 1986-01-22 to 2024-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Richard R  Rupe et al → HIGH RD QUARRY; 1986-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R  Rupe et al → Rupe Slate Company; 1986-01-22 to 2024-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → HIGH RD QUARRY; 1986-03-04 to 2008-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Northeast Slate Incorporated → HIGH RD QUARRY; 2008-01-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** HILLTOP SLATE INC → HIGH RD QUARRY; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Northeast Slate Incorporated → HILLTOP SLATE INC; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → HILLTOP SLATE INC; 2024-03-27 to 2008-01-15; source msha-controller-operator-history