# Relationship history for MSHA mine 4002549

Current hierarchy: **Moore Logan A & John I Foster → L O - J A C Barite Company → No 1 Washing 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sweetwater Minerals Inc → No 1 Washing Plant; 1979-07-01 to 1980-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Zimmerman William A → No 1 Washing Plant; 1979-07-01 to 1980-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Zimmerman William A → Sweetwater Minerals Inc; 1979-07-01 to 1980-01-10; source msha-controller-operator-history
- **operator_operates_mine:** L O - J A C Barite Company → No 1 Washing Plant; 1980-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moore Logan A & John I Foster → No 1 Washing Plant; 1980-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Logan A & John I Foster → L O - J A C Barite Company; 1980-01-11 to current/open; source msha-controller-operator-history