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250,635 · McLean · "Manufacture of Glass Building-Blocks for Sea-Walls, &c." · Page 2
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waters, &c., I do not restrict myself to any particular size, form, or mode of making the blocks.
    Having thus described my invention, I claim—
    1. A building-block made of glass, provided with tongues and grooves or other interlocking devices, for the construction of sea-walls, docks, breakwaters, dykes, &c.
    2. Blocks of glass for building sea-walls,
docks, breakwaters, or other analogous structures, substantially as and for the purpose specified.
    In testimony whereof I hereto affic my signature in the presence of two witnesses.
specified.
CHRISTOPHER W. MCLEAN.
Witnesses:
    A. H. BETZ,
    T. C. BRECHT.