# Relationship history for MSHA mine 1700478

Current hierarchy: **City Of Augusta Me → City Of Augusta-Public Works → City of Augusta Maine Kling Pit**

- 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:** City Of Augusta-Public Works → City of Augusta Maine Kling Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** City Of Augusta Me → City of Augusta Maine Kling Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** City Of Augusta Me → City Of Augusta-Public Works; 1979-01-01 to current/open; source msha-controller-operator-history