# Relationship history for MSHA mine 0504666

Current hierarchy: **Bernard  Buster; Brenda  Buster → BB Stoneworks → Hotchkiss Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** BB Stoneworks → Hotchkiss Mine; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brenda  Buster  et al → Hotchkiss Mine; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda  Buster  et al → BB Stoneworks; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernard  Buster  et al → BB Stoneworks; 1999-09-01 to current/open; source msha-controller-operator-history