# Relationship history for MSHA mine 3608809

Current hierarchy: **Maurice  Newhart Jr; Raymond  Newhart → R & M Stone → ROCKEFELLER 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:** R & M Stone → ROCKEFELLER QUARRY; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maurice  Newhart Jr et al → ROCKEFELLER QUARRY; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurice  Newhart Jr et al → R & M Stone; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Newhart et al → R & M Stone; 1999-09-01 to current/open; source msha-controller-operator-history