# Relationship history for MSHA mine 2102929

Current hierarchy: **Karen L  Nelson Deutish; David B  Nelson → Glacier Paving Inc → Glacier 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:** Nels Nelson & Sons Inc → Glacier Pit; 1984-06-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Karen L  Nelson Deutish et al → Glacier Pit; 1984-06-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Karen L  Nelson Deutish et al → Nels Nelson & Sons Inc; 1984-06-01 to 1986-05-07; source msha-controller-operator-history
- **operator_operates_mine:** South Shore Construction Inc → Glacier Pit; 1986-05-08 to 1990-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Audrey J  Nelson → Glacier Pit; 1986-05-08 to 1990-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Audrey J  Nelson → South Shore Construction Inc; 1986-05-08 to 1990-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Glacier Paving Inc → Glacier Pit; 1990-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karen L  Nelson Deutish et al → Glacier Pit; 1990-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen L  Nelson Deutish et al → Glacier Paving Inc; 1990-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David B  Nelson et al → Glacier Paving Inc; 1990-06-19 to current/open; source msha-controller-operator-history