# Relationship history for MSHA mine 3608629

Current hierarchy: **Tony  Belcher → Belcher & Sons Flagstone → SHARER 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:** Harkness Bluestone → SHARER QUARRY; 1997-04-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Harkness → SHARER QUARRY; 1997-04-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Harkness → Harkness Bluestone; 1997-04-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Tony  Belcher → SHARER QUARRY; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Belcher & Sons Flagstone → SHARER QUARRY; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Belcher → Belcher & Sons Flagstone; 1998-09-02 to current/open; source msha-controller-operator-history