# Relationship history for MSHA mine 3609853

Current hierarchy: **Lucas D  Mack → Cold Ridge Stone LLC → Farm Quarry II**

- 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:** Dean M  Mack  et al → Farm Quarry II; 2008-09-04 to 2020-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Cold Ridge Stone LLC → Farm Quarry II; 2010-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean M  Mack  et al → Cold Ridge Stone LLC; 2010-09-14 to 2020-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Lucas D  Mack  et al → Cold Ridge Stone LLC; 2010-09-14 to 2020-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Lucas D  Mack → Farm Quarry II; 2020-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lucas D  Mack → Cold Ridge Stone LLC; 2020-01-15 to current/open; source msha-controller-operator-history