ES1996A1 -
An etching procedure on the crystal or glass by means of hydrofluoric acid and by direct application on the Judean bitumen of the photographic cliché.
- Google Patents
An etching procedure on the crystal or glass by means of hydrofluoric acid and by direct application on the Judean bitumen of the photographic cliché.
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ES1996A1881-11-101881-11-10
An etching procedure on the crystal or glass by means of hydrofluoric acid and by direct application on the Judean bitumen of the photographic cliché.
ExpiredES1996A1
(en)
A procedure for making the mercury in windows or mirrors to acquire solidity by means of a preparation consisting of giving it one or more coats or layers of a varnish composed of rubbers, alcohols and essences.