Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE520688ApublicationCriticalpatent/BE520688A/xx
D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
D21F7/00—Other details of machines for making continuous webs of paper
D21F7/001—Wire-changing arrangements
G—PHYSICS
G08—SIGNALLING
G08G—TRAFFIC CONTROL SYSTEMS
G08G1/00—Traffic control systems for road vehicles
G08G1/09—Arrangements for giving variable traffic instructions
G08G1/096—Arrangements for giving variable traffic instructions provided with indicators in which a mark progresses showing the time elapsed, e.g. of green phase