# Relationship history for MSHA mine 4501545

Current hierarchy: **Sterling D  Breen → Sterling Breen Crushing Inc → BREEN PORTABLE NO.1**

- 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:** S C Breen Construction Company → BREEN PORTABLE NO.1; 1950-01-01 to 1989-05-10; source msha-controller-operator-history
- **controller_controls_mine:** S C  Breen → BREEN PORTABLE NO.1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S C  Breen → S C Breen Construction Company; 1950-01-01 to 1989-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Breen Crushing Inc → BREEN PORTABLE NO.1; 1989-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sterling D  Breen → BREEN PORTABLE NO.1; 1989-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling D  Breen → Sterling Breen Crushing Inc; 1989-05-11 to current/open; source msha-controller-operator-history