# Relationship history for MSHA mine 1301753

Current hierarchy: **S & G Minerals Corp; Pellco  Co Inc → S & G Materials → SHOWERS SAND PIT**

- 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:** Stevens Sand & Gravel Company Inc → SHOWERS SAND PIT; 1950-01-01 to 1991-03-26; source msha-controller-operator-history
- **controller_controls_mine:** John M  Stevens Jr → SHOWERS SAND PIT; 1950-01-01 to 1991-03-26; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stevens Jr → Stevens Sand & Gravel Company Inc; 1950-01-01 to 1991-03-26; source msha-controller-operator-history
- **controller_controls_mine:** S & G Minerals Corp et al → SHOWERS SAND PIT; 1989-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & G Materials → SHOWERS SAND PIT; 1991-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S & G Minerals Corp et al → S & G Materials; 1991-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pellco  Co Inc → S & G Materials; 1991-03-27 to current/open; source msha-controller-operator-history