# Relationship history for MSHA mine 1513915

Current hierarchy: **Eoff Larry J & Jeffrey D Ferguson → L & J Dredging Company Inc → #1 Dredge**

- 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:** L C Dredging Inc → #1 Dredge; 1983-02-01 to 1985-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Blevins George → #1 Dredge; 1983-02-01 to 1988-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Blevins George → L C Dredging Inc; 1983-02-01 to 1985-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Tugco Limited Partnership → #1 Dredge; 1985-10-15 to 1987-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Hope Raymond & Lon Shannon → #1 Dredge; 1985-10-15 to 1987-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Hope Raymond & Lon Shannon → Tugco Limited Partnership; 1985-10-15 to 1987-03-30; source msha-controller-operator-history
- **operator_operates_mine:** L C Dredging Inc → #1 Dredge; 1987-03-31 to 1988-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Blevins George → L C Dredging Inc; 1987-03-31 to 1988-11-21; source msha-controller-operator-history
- **operator_operates_mine:** L & J Dredging Company Inc → #1 Dredge; 1988-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eoff Larry J & Jeffrey D Ferguson → #1 Dredge; 1988-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eoff Larry J & Jeffrey D Ferguson → L & J Dredging Company Inc; 1988-11-22 to current/open; source msha-controller-operator-history