# Relationship history for MSHA mine 3304065

Current hierarchy: **Robert  Buescher → R W Sidley Inc → Grand River Dock**

- 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:** Robert C  Sidley et al → Grand River Dock; 1950-01-01 to 2022-11-24; source msha-controller-operator-history
- **operator_operates_mine:** R W Sidley Inc → Grand River Dock; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Sidley et al → R W Sidley Inc; 1986-08-01 to 2022-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Buescher → Grand River Dock; 2022-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Buescher → R W Sidley Inc; 2022-11-25 to current/open; source msha-controller-operator-history