# Relationship history for MSHA mine 4300646

Current hierarchy: **David C Camara → CAMARA SLATE PRODUCTS, INC → WARREN SWITCH QUARRY**

- 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:** David C Camara et al → WARREN SWITCH QUARRY; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Baker → WARREN SWITCH QUARRY; 1999-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Switch Rd Slate → WARREN SWITCH QUARRY; 2006-04-26 to 2015-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Anthony R  Keough → WARREN SWITCH QUARRY; 2006-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony R  Keough → Switch Rd Slate; 2006-04-26 to 2015-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Baker Slate Inc → WARREN SWITCH QUARRY; 2015-09-25 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Baker → Baker Slate Inc; 2015-09-25 to 2016-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Camara Slate Products, Inc → WARREN SWITCH QUARRY; 2017-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C Camara et al → Camara Slate Products, Inc; 2017-01-01 to current/open; source msha-controller-operator-history