# Relationship history for MSHA mine 2901794

Current hierarchy: **John T  Schaefer → 151 Sand And Gravel → THE SUPPLIER MINE**

- 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:** Theo R  Brown → THE SUPPLIER MINE; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown Construction Company → THE SUPPLIER MINE; 1980-01-01 to 1998-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Theo R  Brown → Brown Construction Company; 1980-01-01 to 1998-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Fred'S Excavating Inc → THE SUPPLIER MINE; 1998-03-12 to 2006-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Payan → THE SUPPLIER MINE; 1998-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Payan → Fred'S Excavating Inc; 1998-03-12 to 2006-02-16; source msha-controller-operator-history
- **operator_operates_mine:** 151 Sand And Gravel → THE SUPPLIER MINE; 2006-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Schaefer → THE SUPPLIER MINE; 2006-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Schaefer → 151 Sand And Gravel; 2006-02-17 to current/open; source msha-controller-operator-history