# Relationship history for MSHA mine 4202246

Current hierarchy: **Roger N  Chapman; Ryan R  Chapman → Chapman Materials → Washplant**

- 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:** Ned B  Mitchell → Washplant; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ned B Mitchell Inc → Washplant; 1999-05-01 to 2005-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Ned B  Mitchell → Ned B Mitchell Inc; 1999-05-01 to 2005-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Nile Chapman Construction Inc → Washplant; 2005-11-08 to 2010-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Nile M  Chapman → Washplant; 2005-11-08 to 2007-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Nile M  Chapman → Nile Chapman Construction Inc; 2005-11-08 to 2007-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Dalbo Holding Incorporated → Washplant; 2007-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dalbo Holding Incorporated → Nile Chapman Construction Inc; 2007-09-01 to 2010-07-13; source msha-controller-operator-history
- **operator_operates_mine:** R Chapman Construction → Washplant; 2010-07-14 to 2014-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Roger N  Chapman et al → Washplant; 2010-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger N  Chapman et al → R Chapman Construction; 2010-07-14 to 2014-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Ryan R  Chapman et al → R Chapman Construction; 2010-07-14 to 2014-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Chapman Materials → Washplant; 2014-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan R  Chapman et al → Washplant; 2014-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan R  Chapman et al → Chapman Materials; 2014-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger N  Chapman et al → Chapman Materials; 2014-01-29 to current/open; source msha-controller-operator-history