# Relationship history for MSHA mine 4607988

Current hierarchy: **Estanish William → Wsjj Inc → West Form Mine #1**

- 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:** Flex Development Corp → West Form Mine #1; 1990-12-01 to 1993-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Lutman Mikel K → West Form Mine #1; 1990-12-01 to 1993-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Lutman Mikel K → Flex Development Corp; 1990-12-01 to 1993-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Wsjj Inc → West Form Mine #1; 1993-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Estanish William → West Form Mine #1; 1993-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estanish William → Wsjj Inc; 1993-04-08 to current/open; source msha-controller-operator-history