# Relationship history for MSHA mine 4500993

Current hierarchy: **Corliss (Corky)  Smith Jr; Mae L Smith → Olivine Corp → Swen Larsen 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

- **operator_operates_mine:** Miles Sand & Gravel Co Inc → Swen Larsen Quarry; 1950-01-01 to 1993-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Walt  Miles et al → Swen Larsen Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Miles Sand & Gravel Co Inc; 1950-01-01 to 1993-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Mae L Smith et al → Swen Larsen Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olivine Corp → Swen Larsen Quarry; 1993-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mae L Smith et al → Olivine Corp; 1993-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corliss (Corky)  Smith Jr et al → Olivine Corp; 1993-10-20 to current/open; source msha-controller-operator-history