# Relationship history for MSHA mine 2602205

Current hierarchy: **David A  Spicer → D & H Mining Ltd Partnership → D&H MINING RANCH 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:** D & H Mining Ltd Partnership → D&H MINING RANCH PIT; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A  Spicer → D&H MINING RANCH PIT; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Spicer → D & H Mining Ltd Partnership; 1992-04-01 to current/open; source msha-controller-operator-history