# Relationship history for MSHA mine 1700588

Current hierarchy: **Charlotte B  Gerrish → Earl Gerrish & Sons Inc → Gerrish 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Earl Gerrish & Sons Inc → Gerrish Pit; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Gerrish Jr → Gerrish Pit; 1988-06-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Gerrish Jr → Earl Gerrish & Sons Inc; 1988-06-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Charlotte B  Gerrish → Gerrish Pit; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlotte B  Gerrish → Earl Gerrish & Sons Inc; 2016-01-01 to current/open; source msha-controller-operator-history