# Relationship history for MSHA mine 4503086

Current hierarchy: **Alan Lee  Good → Good Crushing Inc → Good Portable 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Wallace Brothers Construction Company → Good Portable Crusher; 1986-05-01 to 1988-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Dale L  Wallace → Good Portable Crusher; 1986-05-01 to 1988-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Dale L  Wallace → Wallace Brothers Construction Company; 1986-05-01 to 1988-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Good Crushing Inc → Good Portable Crusher; 1988-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alan Lee  Good → Good Portable Crusher; 1988-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan Lee  Good → Good Crushing Inc; 1988-09-14 to current/open; source msha-controller-operator-history