# Relationship history for MSHA mine 3102068

Current hierarchy: **Henry B  Long → 46 Sand & Stone → 46 Sand & 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

- **operator_operates_mine:** Garysburg Sand & Gravel Inc → 46 Sand & Stone; 1990-01-01 to 1996-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Watson  Drew Jr → 46 Sand & Stone; 1990-01-01 to 1996-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Watson  Drew Jr → Garysburg Sand & Gravel Inc; 1990-01-01 to 1996-08-07; source msha-controller-operator-history
- **operator_operates_mine:** 46 Sand & Stone → 46 Sand & Stone; 1996-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry B  Long → 46 Sand & Stone; 1996-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry B  Long → 46 Sand & Stone; 1996-08-08 to current/open; source msha-controller-operator-history