# Relationship history for MSHA mine 0201719

Current hierarchy: **Allen Toby & Bruce Greer → G & A Sand & Gravel Inc → Huachuca 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:** Maddux & Son'S Inc → Huachuca Pit; 1950-01-01 to 1983-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Lenard R  Maddux → Huachuca Pit; 1950-01-01 to 2015-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Lenard R  Maddux → Maddux & Son'S Inc; 1950-01-01 to 1983-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Huachuca Materials & Concrete Company Inc → Huachuca Pit; 1983-03-29 to 1984-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Compton Ray → Huachuca Pit; 1983-03-29 to 1984-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Compton Ray → Huachuca Materials & Concrete Company Inc; 1983-03-29 to 1984-08-09; source msha-controller-operator-history
- **operator_operates_mine:** G & A Sand & Gravel Inc → Huachuca Pit; 1984-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen Toby & Bruce Greer → Huachuca Pit; 1984-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen Toby & Bruce Greer → G & A Sand & Gravel Inc; 1984-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clinton R  Maddux et al → Huachuca Pit; 2015-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clinton R  Maddux et al → Maddux & Son'S Inc; 2015-03-27 to 1983-03-28; source msha-controller-operator-history
- **controller_controls_operator:** James C  Maddux et al → Maddux & Son'S Inc; 2015-03-27 to 1983-03-28; source msha-controller-operator-history