# Relationship history for MSHA mine 4103927

Current hierarchy: **John  Barten → Jebco Abrasives Inc → JEBCO (MATTHEWS PLANT)**

- 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

- **controller_controls_mine:** John  Barten → JEBCO (MATTHEWS PLANT); 1993-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jebco Abrasives Inc → JEBCO (MATTHEWS PLANT); 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Barten → Jebco Abrasives Inc; 1996-09-01 to current/open; source msha-controller-operator-history