H. Ray Holder Books

Dewalt electrical licensing exam guide
Dewalt electrical licensing exam guide

By H. Ray Holder

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A comprehensive exam study guide for electricians and apprentices that can be utilized in every state. Updated for the NEC 2014, this book is ideal for preparing to take the Journeyman, Contractor,...

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DeWalt electrical licensing exam guide
DeWalt electrical licensing exam guide

By H. Ray Holder

Average: 0.00, 0 Ratings

Shares test-taking strategies, regulations, and subject review for the journeyman, contractor, master, maintenance, residential, and sign licensing examinations, as well as over five hundred practi...

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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