# Relationship history for MSHA mine 0504912

Current hierarchy: **Travis  Sackman; Jeff  French → SAKO EXCAVATION LLC → COUNTY ROAD 23 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** SAKO Excavation LLC → COUNTY ROAD 23 PIT; 2008-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Sackman et al → COUNTY ROAD 23 PIT; 2008-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Sackman et al → SAKO Excavation LLC; 2008-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  French et al → SAKO Excavation LLC; 2008-07-31 to current/open; source msha-controller-operator-history