# Relationship history for MSHA mine 1900504

Current hierarchy: **Joseph A  Arruda → B R S Inc → B R S 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

- **controller_controls_mine:** David R  Smith Jr → B R S Inc; 1978-06-01 to 1989-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Bridgewater Washed Sand & Gravel Company → B R S Inc; 1980-05-01 to 1982-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Gourdin → B R S Inc; 1980-05-01 to 1982-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Gourdin → Bridgewater Washed Sand & Gravel Company; 1980-05-01 to 1982-10-31; source msha-controller-operator-history
- **operator_operates_mine:** C & S Sand & Gravel Corp → B R S Inc; 1982-11-01 to 1987-03-17; source msha-controller-operator-history
- **controller_controls_operator:** David R  Smith Jr → C & S Sand & Gravel Corp; 1982-11-01 to 1987-03-17; source msha-controller-operator-history
- **operator_operates_mine:** P Bradshaw Corp → B R S Inc; 1987-03-18 to 1992-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Paul W  Bradshaw → B R S Inc; 1987-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul W  Bradshaw → P Bradshaw Corp; 1987-03-18 to 1992-05-17; source msha-controller-operator-history
- **operator_operates_mine:** J-1 Corp → B R S Inc; 1992-05-18 to 1998-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Jean  Langlois → B R S Inc; 1992-05-18 to 1998-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Jean  Langlois → J-1 Corp; 1992-05-18 to 1998-03-25; source msha-controller-operator-history
- **operator_operates_mine:** B R S Inc → B R S Inc; 1998-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph A  Arruda et al → B R S Inc; 1998-03-26 to 2015-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Arruda et al → B R S Inc; 1998-03-26 to 2015-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Daniel G  Kirker et al → B R S Inc; 1998-03-26 to 2015-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Joseph A  Arruda → B R S Inc; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Arruda → B R S Inc; 2015-10-26 to current/open; source msha-controller-operator-history