# Relationship history for MSHA mine 1601006

Current hierarchy: **Irby Meyer → Blast Abrasives Inc → New Iberia 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Irby Meyer → New Iberia Plant; 1980-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blast Abrasives Inc → New Iberia Plant; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irby Meyer → Blast Abrasives Inc; 1981-06-01 to current/open; source msha-controller-operator-history