# Relationship history for MSHA mine 1700719

Current hierarchy: **Glenn T  Jacobs Sr → JACOBS EXCAVATING INC → KOLBERG PORTABLE SCREEN**

- 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:** JACOBS EXCAVATING INC → KOLBERG PORTABLE SCREEN; 2002-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glenn T  Jacobs Sr → KOLBERG PORTABLE SCREEN; 2002-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn T  Jacobs Sr → JACOBS EXCAVATING INC; 2002-04-09 to current/open; source msha-controller-operator-history