# Relationship history for MSHA mine 4104738

Current hierarchy: **Tony L  Jacobs Jr → Jacobs Stone Products, Inc. → Jacobs Stone Products, Inc.**

- 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 & Son Enterprises Inc → Jacobs Stone Products, Inc.; 2008-06-20 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Tony L  Jacobs Sr → Jacobs Stone Products, Inc.; 2008-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony L  Jacobs Sr → Jacobs & Son Enterprises Inc; 2008-06-20 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Jacobs Stone Products, Inc. → Jacobs Stone Products, Inc.; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tony L  Jacobs Jr → Jacobs Stone Products, Inc.; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony L  Jacobs Jr → Jacobs Stone Products, Inc.; 2013-01-01 to current/open; source msha-controller-operator-history