# Relationship history for MSHA mine 3610403

Current hierarchy: **Stephen  Hess; Scott  Hess → Daggett Sand and Gravel, Inc. → TESAB RK623 PORTABLE CRUSHER SN44117**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Scott  Hess et al → TESAB RK623 PORTABLE CRUSHER SN44117; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Daggett Sand and Gravel, Inc. → TESAB RK623 PORTABLE CRUSHER SN44117; 2022-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Hess et al → Daggett Sand and Gravel, Inc.; 2022-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Hess et al → Daggett Sand and Gravel, Inc.; 2022-09-05 to current/open; source msha-controller-operator-history