# Relationship history for MSHA mine 0405577

Current hierarchy: **Marc P  Springer → Spanish Flat Mining Co. → Grit 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:** Marc P  Springer → Grit Mine; 1996-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Spanish Flat Mining Co. → Grit Mine; 2003-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marc P  Springer → Spanish Flat Mining Co.; 2003-10-19 to current/open; source msha-controller-operator-history