# Relationship history for MSHA mine 0202723

Current hierarchy: **Merritt Harold → Harold Merritt Stone → MERRITT QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Harold Merritt Stone → MERRITT QUARRY; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merritt Harold → MERRITT QUARRY; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merritt Harold → Harold Merritt Stone; 1997-10-01 to current/open; source msha-controller-operator-history