# Relationship history for MSHA mine 0504623

Current hierarchy: **Lee  Sutherland; Bob  Sutherland → West End Gravel Company Inc → 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

- **controller_controls_mine:** Lee  Sutherland et al → PIT #1; 1996-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West End Gravel Company Inc → PIT #1; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee  Sutherland et al → West End Gravel Company Inc; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Sutherland et al → West End Gravel Company Inc; 1998-07-01 to current/open; source msha-controller-operator-history