# Relationship history for MSHA mine 3003520

Current hierarchy: **Matt A Kilmer → Matt Kilmer Flagstone LLC → Balducci 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

- **controller_controls_mine:** Tammy L  Norton → Balducci Quarry; 2003-01-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tammy & Norm Norton (Norm Norton Stone) → Balducci Quarry; 2006-01-18 to 2007-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Tammy L  Norton → Tammy & Norm Norton (Norm Norton Stone); 2006-01-18 to 2007-05-10; source msha-controller-operator-history
- **controller_controls_mine:** John N  Balducci et al → Balducci Quarry; 2007-01-23 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Balducci Bluestone LLC → Balducci Quarry; 2007-05-11 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_operator:** John N  Balducci et al → Balducci Bluestone LLC; 2007-05-11 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jennifer W  Balducci et al → Balducci Bluestone LLC; 2007-05-11 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John N  Balducci → Balducci Quarry; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John N  Balducci → Balducci Bluestone LLC; 2013-01-01 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Matt A Kilmer → Balducci Quarry; 2017-04-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Matt Kilmer Flagstone LLC → Balducci Quarry; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt A Kilmer → Matt Kilmer Flagstone LLC; 2025-06-12 to current/open; source msha-controller-operator-history