# Relationship history for MSHA mine 4202064

Current hierarchy: **Brian  Bland → Bland's Topsoil Sand & Gravel Company → PIT #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:** Bland'S Topsoil Sand & Gravel Company → PIT #1; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Bland → PIT #1; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Bland → Bland'S Topsoil Sand & Gravel Company; 1990-10-01 to current/open; source msha-controller-operator-history