# Relationship history for MSHA mine 0103094

Current hierarchy: **Calvin  Bradford; Valerie  Bradford → C & D Sand & Gravel Inc → HICKS PIT**

- 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:** C & D Sand & Gravel Inc → HICKS PIT; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Valerie  Bradford  et al → HICKS PIT; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valerie  Bradford  et al → C & D Sand & Gravel Inc; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calvin  Bradford  et al → C & D Sand & Gravel Inc; 1997-03-01 to current/open; source msha-controller-operator-history