# Relationship history for MSHA mine 4801403

Current hierarchy: **Morris Gary W & William J → S & M Construction Inc → Durham Pit**

- 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:** Morris Gary W & William J → Durham Pit; 1978-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & M Construction Inc → Durham Pit; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morris Gary W & William J → S & M Construction Inc; 1984-03-01 to current/open; source msha-controller-operator-history