Baustein Sätze (Block Sets)
Braun sold about 41 'accessory' LECTRON packs. These could be used as block replacements or as supplementary blocks to support ad hoc experiment development. The graphic below was provided to me by Günther Stabe of RadioMuseum.org fame.
A complete list of the available blister packs was profiled in the first two pages of Braun's January 1st, 1968 price list.
Mr. Stabe also prepared this excellent recreation of the various packs which were listed in the above price list using the series numbers of 4001 - 4067. Yes the math is wrong for a count of 41 but Braun skipped some numbers!