# Relationship history for MSHA mine 1201703

Current hierarchy: **Shaw Ronald B & Richard D → Shaw Contractors & Builders → Lords Pit #1 Strip**

- 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:** Shaw Ronald B & Richard D → Lords Pit #1 Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shaw Contractors & Builders → Lords Pit #1 Strip; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaw Ronald B & Richard D → Shaw Contractors & Builders; 1979-07-01 to current/open; source msha-controller-operator-history