# Relationship history for MSHA mine 0404688

Current hierarchy: **Boyd Vincent Sears III Estate → Butte Equipment Rentals Inc → Bear Creek 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:** Division Of Gordon R Shepherd Inc → Bear Creek Quarry; 1984-02-01 to 1996-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Gordon R  Shepherd → Bear Creek Quarry; 1984-02-01 to 1996-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Gordon R  Shepherd → Division Of Gordon R Shepherd Inc; 1984-02-01 to 1996-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Butte Equipment Rentals Inc → Bear Creek Quarry; 1996-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boyd  Sears → Bear Creek Quarry; 1996-12-04 to 2015-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Boyd  Sears → Butte Equipment Rentals Inc; 1996-12-04 to 2015-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Boyd Vincent Sears III Estate → Bear Creek Quarry; 2015-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Vincent Sears III Estate → Butte Equipment Rentals Inc; 2015-10-21 to current/open; source msha-controller-operator-history