# Relationship history for MSHA mine 4700957

Current hierarchy: **Charles H  Johnson; Dave  Johnson et el; Steve  Johnson → West Bend Sand & Stone, Inc. → Schelle 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:** West Bend Sand & Stone, Inc. → Schelle Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles H  Johnson et al → Schelle Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Johnson et al → West Bend Sand & Stone, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Johnson et el → West Bend Sand & Stone, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Johnson et al → West Bend Sand & Stone, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history