# Relationship history for MSHA mine 3800740

Current hierarchy: **Jason C  Deck → Ameri-con Materials Inc → Blacksburg Mine**

- 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

- **controller_controls_mine:** James L  Deck → Blacksburg Mine; 1997-01-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Deck Sand Company Inc → Blacksburg Mine; 2012-10-29 to 2013-06-29; source msha-controller-operator-history
- **controller_controls_operator:** James L  Deck → Deck Sand Company Inc; 2012-10-29 to 2013-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Ameri-con Materials Inc → Blacksburg Mine; 2013-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason C  Deck → Blacksburg Mine; 2013-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason C  Deck → Ameri-con Materials Inc; 2013-06-30 to current/open; source msha-controller-operator-history