# Relationship history for MSHA mine 3605139

Current hierarchy: **Leonard  Chapleski; Walter  Folger → Ranshaw Transportation & Auto Wreckers Company → Atlas Strip Mine**

- 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:** Walter  Folger et al → Atlas Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ranshaw Transportation & Auto Wreckers Company → Atlas Strip Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter  Folger et al → Ranshaw Transportation & Auto Wreckers Company; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Chapleski et al → Ranshaw Transportation & Auto Wreckers Company; 1974-01-01 to current/open; source msha-controller-operator-history