# Relationship history for MSHA mine 4105111

Current hierarchy: **Jake  Schwartz → JWS Blackrock Inc → Flat Rock Hirt 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:** JWS Blackrock Inc → Flat Rock Hirt Quarry; 2015-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jake  Schwartz → Flat Rock Hirt Quarry; 2015-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jake  Schwartz → JWS Blackrock Inc; 2015-08-13 to current/open; source msha-controller-operator-history