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Scientific apparatus and instruments --- Collectors and collecting --- -681 <09> --- 681.7 --- 389 <09> --- 529.78 <09> --- 527 --- Apparatus, Scientific --- Instruments, Scientific --- Science --- Scientific instruments --- Research --- Precision mechanisms and instruments--Geschiedenis van ... --- Optical apparatus and instruments --- Metrologie--Geschiedenis van ... --- Time-measuring instruments. Clock setting, regulating. Time standards. Quartz crystal etc. Sundials. Gnomons--Geschiedenis van ... --- Nautical and aeronautical astronomy. Navigation --- Instruments --- Equipment and supplies --- Collectors and collecting. --- 527 Nautical and aeronautical astronomy. Navigation --- 529.78 <09> Time-measuring instruments. Clock setting, regulating. Time standards. Quartz crystal etc. Sundials. Gnomons--Geschiedenis van ... --- 389 <09> Metrologie--Geschiedenis van ... --- 681.7 Optical apparatus and instruments --- 681 <09> Precision mechanisms and instruments--Geschiedenis van ... --- 681 <09> --- Metrologie--Geschiedenis van .. --- Time-measuring instruments. Clock setting, regulating. Time standards. Quartz crystal etc. Sundials. Gnomons--Geschiedenis van .. --- Precision mechanisms and instruments--Geschiedenis van .. --- Metrologie--Geschiedenis van . --- Metrologie--Geschiedenis van --- Scientific apparatus and instruments - Collectors and collecting