# Relationship history for MSHA mine 0103329

Current hierarchy: **Glenn L  Bradford → Glenn Bradford Gravel Co → Jackson Pit #2**

- 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:** Glenn Bradford Gravel Co → Jackson Pit #2; 2005-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glenn L  Bradford → Jackson Pit #2; 2005-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn L  Bradford → Glenn Bradford Gravel Co; 2005-08-04 to current/open; source msha-controller-operator-history