# Relationship history for MSHA mine 1901239

Current hierarchy: **James L  Barishian → New England Gravel Haulers → Pegson 26x44 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

- **operator_operates_mine:** New England Gravel Haulers → Pegson 26x44 Jaw Crusher; 2013-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Barishian → Pegson 26x44 Jaw Crusher; 2013-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Barishian → New England Gravel Haulers; 2013-04-16 to current/open; source msha-controller-operator-history