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In the same way you zip up your jacket, the “zipper truck” quickly assembles tunnels and archways by locking together pre-made concrete blocks that fit tightly together. Lock-Block Ltd. has eliminated ...

Concrete blocks. Ever since manufacturers developed techniques to make them cheaper than traditional clay-fired bricks, concrete blocks have been one of our most ubiquitous construction materials.

Reviews and recommendations are unbiased and products are independently selected. Postmedia may earn an affiliate commission from purchases made through links on this page. What started out as the ...