# Relationship history for MSHA mine 4300768

Current hierarchy: **Jacob D  Simpson → SIMPSON DIRTWORX LLC → Pettibone Jaw Crusher**

- 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

- **controller_controls_mine:** Jacob D  Simpson → Pettibone Jaw Crusher; 2013-06-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SIMPSON DIRTWORX LLC → Pettibone Jaw Crusher; 2015-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob D  Simpson → SIMPSON DIRTWORX LLC; 2015-06-18 to current/open; source msha-controller-operator-history