# Relationship history for MSHA mine 1900700

Current hierarchy: **Town Of Auburn-Ma → Town Of Auburn → Landfill & Oxford Street Pits And Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Town Of Auburn → Landfill & Oxford Street Pits And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Town Of Auburn-Ma → Landfill & Oxford Street Pits And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Auburn-Ma → Town Of Auburn; 1950-01-01 to current/open; source msha-controller-operator-history