# Relationship history for MSHA mine 3002646

Current hierarchy: **Town of Greenfield-NY → Town of Ballston → Greenfield Gravel Bed**

- 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

- **operator_operates_mine:** Tri-Town Gravel Bed → Greenfield Gravel Bed; 1984-01-01 to 2008-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Towns Of Greenfield Ballston & Malta-Ny → Greenfield Gravel Bed; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Towns Of Greenfield Ballston & Malta-Ny → Tri-Town Gravel Bed; 1984-01-01 to 2008-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Town of Greenfield → Greenfield Gravel Bed; 2008-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Town of Greenfield-NY → Greenfield Gravel Bed; 2008-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town of Greenfield-NY → Town of Greenfield; 2008-05-28 to current/open; source msha-controller-operator-history