# Relationship history for MSHA mine 3608906

Current hierarchy: **Franklin S  Schall → Northern Son Inc → Brink**

- 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:** Terry L  Schall → Brink; 1993-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Mack Leasing Company Inc → Brink; 2001-02-01 to 2002-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Schall → Big Mack Leasing Company Inc; 2001-02-01 to 2002-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Franklin S  Schall → Brink; 2002-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Son Inc → Brink; 2002-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin S  Schall → Northern Son Inc; 2002-09-05 to current/open; source msha-controller-operator-history