# Relationship history for MSHA mine 5001607

Current hierarchy: **Thomas A  Henkel → T & J Gravel Products Inc → T & J Gravel Products Incorporated**

- 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:** Beaver Lake Excavating & Construction → T & J Gravel Products Incorporated; 1993-03-01 to 1997-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Donna L  Little → T & J Gravel Products Incorporated; 1993-03-01 to 1997-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Donna L  Little → Beaver Lake Excavating & Construction; 1993-03-01 to 1997-06-19; source msha-controller-operator-history
- **operator_operates_mine:** T & J Gravel Products Inc → T & J Gravel Products Incorporated; 1997-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas A  Henkel → T & J Gravel Products Incorporated; 1997-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Henkel → T & J Gravel Products Inc; 1997-06-20 to current/open; source msha-controller-operator-history