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				Engraving of signature on glass is to be seen approx. 1940 and 
				proceeds to the end of 1980s and start of the 1990s, after that 
				signature is beginning to be done by laser technique.
 It is my impression that engravings of signature on production 
				subjects has been random done as to how many items of the 
				production that did receive a signature, did depend very much on 
				how much spare time employees to do this quit time consuming 
				process.
 
 In the end of the 1980s it seems that signature to items is quit 
				less in numbers than you will find in the 1960s and the 1970s, 
				perhaps that is due to that there still was quit a few cutters 
				and engravers employed yet.
 
 Unique (one of a kind) items, test items (mostly 2-9 items) was 
				all engraved with signature often done bye the glassblower, an 
				employee a skilled engraver or even the designer self.
 
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