It appears these type of bricks date before 1930 - some were used in the Empire State Building. So called because it is iron in reverse. Accrington manufactured, acid resistant. I will look on some more .....
Practice, that is all. I have been so used to selective speed reading when looking for a material or product when I was in charge of building projects, also analysing between real info and fluffy drudgery. It helps me when searching the net. It is important when net searching to keep phrases and word groups in the right order and to be creative and to vary some words - it is also important to place some words in quotes, to prevent parallel useless answers and those that are best avoided. Practice that is all.
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