# Relationship history for MSHA mine 1102731

Current hierarchy: **Donald R  Swinson → Donald R Swinson → Rock View Stone**

- 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:** William Charles Ltd → Rock View Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rockford Sand & Gravel Inc → Rock View Stone; 1980-05-01 to 1981-01-20; source msha-controller-operator-history
- **controller_controls_operator:** William Charles Ltd → Rockford Sand & Gravel Inc; 1980-05-01 to 1981-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Donald R Swinson → Rock View Stone; 1981-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Swinson → Rock View Stone; 1981-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Swinson → Donald R Swinson; 1981-01-21 to current/open; source msha-controller-operator-history