# Relationship history for MSHA mine 0504578

Current hierarchy: **Steve  Baker → WR Aggregates → WR JAW CRUSHER**

- 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:** White River Sand & Gravel L L C → WR JAW CRUSHER; 1996-06-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Benton D  Jensen → WR JAW CRUSHER; 1996-06-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Benton D  Jensen → White River Sand & Gravel L L C; 1996-06-01 to 1997-06-30; source msha-controller-operator-history
- **operator_operates_mine:** White River Aggregates Inc → WR JAW CRUSHER; 1997-07-01 to 2007-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Jack E  Paulson → WR JAW CRUSHER; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack E  Paulson → White River Aggregates Inc; 1997-07-01 to 2007-04-30; source msha-controller-operator-history
- **operator_operates_mine:** WR Aggregates → WR JAW CRUSHER; 2007-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Baker → WR JAW CRUSHER; 2007-05-01 to 2008-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Baker → WR Aggregates; 2007-05-01 to 2008-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Avgares → WR Aggregates; 2007-05-01 to 2008-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Baker → WR JAW CRUSHER; 2008-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Baker → WR Aggregates; 2008-06-25 to current/open; source msha-controller-operator-history