# Relationship history for MSHA mine 0405504

Current hierarchy: **Corkey  Harmon → Stimpel Wiebelhaus Associates, Inc. → SWA @ Mountain Gate Quarry**

- 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:** Stimpel Wiebelhaus Associates → SWA @ Mountain Gate Quarry; 2001-07-01 to 2007-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Stimpel → SWA @ Mountain Gate Quarry; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Stimpel → Stimpel Wiebelhaus Associates; 2001-07-01 to 2007-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Stimpel Wiebelhaus Associates, Inc. → SWA @ Mountain Gate Quarry; 2007-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Tyler et al → SWA @ Mountain Gate Quarry; 2007-11-20 to 2011-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Tyler et al → Stimpel Wiebelhaus Associates, Inc.; 2007-11-20 to 2011-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Phil  George et al → Stimpel Wiebelhaus Associates, Inc.; 2007-11-20 to 2011-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Corkey  Harmon → SWA @ Mountain Gate Quarry; 2011-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corkey  Harmon → Stimpel Wiebelhaus Associates, Inc.; 2011-06-07 to current/open; source msha-controller-operator-history