# Relationship history for MSHA mine 0405687

Current hierarchy: **Scott  Farley; Kurt  Kernen → Kernen Construction → Bear Butte 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

- **controller_controls_mine:** Kurt  Kernen et al → Bear Butte Quarry; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shawn T  Studebaker → Bear Butte Quarry; 2003-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kernen Construction → Bear Butte Quarry; 2006-05-26 to 2016-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Kernen et al → Kernen Construction; 2006-05-26 to 2016-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Farley et al → Kernen Construction; 2006-05-26 to 2016-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Laytonville Rock → Bear Butte Quarry; 2016-04-10 to 2021-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Shawn T  Studebaker → Laytonville Rock; 2016-04-10 to 2021-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Kernen Construction → Bear Butte Quarry; 2021-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Kernen et al → Kernen Construction; 2021-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Farley et al → Kernen Construction; 2021-04-07 to current/open; source msha-controller-operator-history