# Relationship history for MSHA mine 3800596

Current hierarchy: **Ned  Gumble → Carolina Vermiculite Div-Va Vermiculite LLC → BROWN # 2**

- 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

- **controller_controls_mine:** Robert  Sansom → BROWN # 2; 1978-03-09 to 2009-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Vermiculite Company Inc → BROWN # 2; 1984-01-01 to 1990-02-12; source msha-controller-operator-history
- **controller_controls_mine:** William A  Strong → BROWN # 2; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A  Strong → Carolina Vermiculite Company Inc; 1984-01-01 to 1990-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Vermiculite Div-Va Vermiculite LLC → BROWN # 2; 1990-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Sansom → Carolina Vermiculite Div-Va Vermiculite LLC; 1990-02-13 to 2009-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Ned  Gumble et al → BROWN # 2; 2009-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ned  Gumble et al → Carolina Vermiculite Div-Va Vermiculite LLC; 2009-02-12 to current/open; source msha-controller-operator-history