# Relationship history for MSHA mine 3401694

Current hierarchy: **James A  Corff → Corff Sand & Gravel Inc → Arkoma Plant**

- 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

- **controller_controls_mine:** James A  Corff → Arkoma Plant; 1988-04-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Corff Sand & Gravel Inc → Arkoma Plant; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Corff → Corff Sand & Gravel Inc; 1989-09-01 to current/open; source msha-controller-operator-history