# Relationship history for MSHA mine 0301774

Current hierarchy: **Roy L  Drum → Poinsett Sand & Gravel Inc. → Poinsett Sand & Gravel Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Poinsett Sand & Gravel Inc. → Poinsett Sand & Gravel Inc.; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy L  Drum → Poinsett Sand & Gravel Inc.; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  Drum → Poinsett Sand & Gravel Inc.; 1996-05-01 to current/open; source msha-controller-operator-history