# Relationship history for MSHA mine 4104490

Current hierarchy: **Connie  Spiegel → Shallow Ford Construction Co., Inc. → Lehigh Quarry**

- 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:** Connie  Spiegel et al → Lehigh Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shallow Ford Construction Co., Inc. → Lehigh Quarry; 2004-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Connie  Spiegel et al → Shallow Ford Construction Co., Inc.; 2004-09-14 to current/open; source msha-controller-operator-history