# Relationship history for MSHA mine 4300616

Current hierarchy: **Craig E  Markcrow → Vermont Structural Slate Co., Inc. → Pelkey 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 → Pelkey Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vermont Structural Slate Co., Inc. → Pelkey Quarry; 2004-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig E  Markcrow → Vermont Structural Slate Co., Inc.; 2004-09-08 to current/open; source msha-controller-operator-history