# Relationship history for MSHA mine 3503632

Current hierarchy: **James B.  Sweitz; Tamara M.  Sweitz → James B. Sweitz Dump Trucking → James B. Sweitz Dump Trucking**

- 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:** James B. Sweitz Dump Trucking → James B. Sweitz Dump Trucking; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James B.  Sweitz et al → James B. Sweitz Dump Trucking; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B.  Sweitz et al → James B. Sweitz Dump Trucking; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tamara M.  Sweitz et al → James B. Sweitz Dump Trucking; 2006-03-01 to current/open; source msha-controller-operator-history