# Relationship history for MSHA mine 4300042

Current hierarchy: **Fabrizio  Ponzanelli → Vermont Quarries Corp. → DANBY 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:** Vermont Marble Company → DANBY QUARRY; 1950-01-01 to 1993-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Omya Industries Inc → DANBY QUARRY; 1950-01-01 to 1996-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Omya Industries Inc → Vermont Marble Company; 1950-01-01 to 1993-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Vermont Quarries Corp. → DANBY QUARRY; 1993-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fabrizio  Ponzanelli → DANBY QUARRY; 1993-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fabrizio  Ponzanelli → Vermont Quarries Corp.; 1993-01-18 to current/open; source msha-controller-operator-history