# Relationship history for MSHA mine 3102110

Current hierarchy: **Stone Connection Inc → Dunns Mountain Pink Granite Company → DUNNS 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:** Dunns Mountain Pink Granite Company Inc → DUNNS QUARRY; 1995-05-01 to 1997-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Tenvik Rolf → DUNNS QUARRY; 1995-05-01 to 1997-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Tenvik Rolf → Dunns Mountain Pink Granite Company Inc; 1995-05-01 to 1997-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Dunns Mountain Pink Granite Company → DUNNS QUARRY; 1997-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stone Connection Inc → DUNNS QUARRY; 1997-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stone Connection Inc → Dunns Mountain Pink Granite Company; 1997-02-17 to current/open; source msha-controller-operator-history