# Relationship history for MSHA mine 4703311

Current hierarchy: **Kenneth R  Ness; Frederick J  Schindler → Express Disposal Inc → Screener #1**

- 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:** Marawood Sand & Gravel, LLC. → Screener #1; 2002-06-25 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Brawn et al → Screener #1; 2002-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Brawn et al → Marawood Sand & Gravel, LLC.; 2002-06-25 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Frederick  Schindler et al → Marawood Sand & Gravel, LLC.; 2002-06-25 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Braun Concrete & Excavating Inc → Screener #1; 2004-01-01 to 2007-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Michael V  Braun  et al → Screener #1; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael V  Braun  et al → Braun Concrete & Excavating Inc; 2004-01-01 to 2007-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Terry C  Weyer  et al → Braun Concrete & Excavating Inc; 2004-01-01 to 2007-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Express Disposal Inc → Screener #1; 2007-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frederick J  Schindler  et al → Screener #1; 2007-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick J  Schindler  et al → Express Disposal Inc; 2007-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth R  Ness  et al → Express Disposal Inc; 2007-02-26 to current/open; source msha-controller-operator-history