# Relationship history for MSHA mine 0201880

Current hierarchy: **Clinton R  Maddux; James C  Maddux → Maddux & Son's Inc → Portec 48cone Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Lenard R  Maddux → Portec 48cone Crusher; 1950-01-01 to 2015-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Maddux & Son's Inc → Portec 48cone Crusher; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lenard R  Maddux → Maddux & Son's Inc; 1978-03-09 to 2015-03-26; source msha-controller-operator-history
- **controller_controls_mine:** James C  Maddux et al → Portec 48cone Crusher; 2015-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Maddux et al → Maddux & Son's Inc; 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 current/open; source msha-controller-operator-history