# Relationship history for MSHA mine 1302183

Current hierarchy: **Cherokee County-IA → Cherokee County → Portable #1**

- 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:** Kenneth L Mauer Construction Company → Portable #1; 1991-05-01 to 1994-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Mauer → Portable #1; 1991-05-01 to 1994-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Mauer → Kenneth L Mauer Construction Company; 1991-05-01 to 1994-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee County → Portable #1; 1994-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cherokee County-IA → Portable #1; 1994-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cherokee County-IA → Cherokee County; 1994-06-30 to current/open; source msha-controller-operator-history