# Relationship history for MSHA mine 1700780

Current hierarchy: **William C  Fraser; Linwood D  Fraser → Fraser Brothers Inc → Jefferson Pit**

- 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:** Fraser Brothers Inc → Jefferson Pit; 2005-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William C  Fraser et al → Jefferson Pit; 2005-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William C  Fraser et al → Fraser Brothers Inc; 2005-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linwood D  Fraser et al → Fraser Brothers Inc; 2005-07-01 to current/open; source msha-controller-operator-history