G BLOCK FOB CONCBETE CONSTBUCTION. the accompanying engraving. The attachment com- the nail from the finger, whereupon the hammer may One of the' drawbacks to the use of concrete for the prises a U-shaped frame A, having a short upper hori- be used to drive the nail in the usual manner. The walls… … and outer facings for the concrete. The inner face NAIL-HOLDING DEVICE FOB HAMMEBS. ATTACHMENT FOB SEWING MACHINES.
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