# Relationship history for MSHA mine 1302163

Current hierarchy: **S & G Minerals Corp; Pellco  Co Inc → S & G Materials → Williams Sandpit**

- 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:** S & G Materials → Williams Sandpit; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** S & G Minerals Corp et al → Williams Sandpit; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S & G Minerals Corp et al → S & G Materials; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pellco  Co Inc → S & G Materials; 1989-01-01 to current/open; source msha-controller-operator-history