# Relationship history for MSHA mine 4300359

Current hierarchy: **Craig E  Markcrow → VERMONT STRUCTURAL SLATE COMPANY INC → BUSH 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Craig E  Markcrow → BUSH QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Slate Company, Inc. → BUSH QUARRY; 1981-06-01 to 2015-03-19; source msha-controller-operator-history
- **controller_controls_mine:** James J Dunlap → BUSH QUARRY; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James J Dunlap → Northern Slate Company, Inc.; 1981-06-01 to 2015-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Vermont Structural Slate Company Inc → BUSH QUARRY; 2015-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig E  Markcrow → Vermont Structural Slate Company Inc; 2015-03-20 to current/open; source msha-controller-operator-history