# Relationship history for MSHA mine 3401017

Current hierarchy: **Scott A  Waller → Mohawk Rock & Sand Company Inc → Dryer #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:** Scott A  Waller et al → Dryer #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Sand Company → Dryer #2; 1950-01-01 to 1992-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Huff Carol → Dryer #2; 1950-01-01 to 1992-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Huff Carol → Industrial Sand Company; 1950-01-01 to 1992-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Mohawk Rock & Sand Company Inc → Dryer #2; 1992-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott A  Waller et al → Mohawk Rock & Sand Company Inc; 1992-04-02 to current/open; source msha-controller-operator-history