a collection of light bulbs
... that a collection of light bulbs was bought by General Electric in 1912 for $10,000 and by 1931 was valued at over a million dollars?
... that <b id="mwAuw"><a class="new" data-mw-i18n='{"title":{"lang":"x-page","key":"red-link-title","params":["Hammer Historical Collection of Incandescent Electric Lamps"]}}' href="./Hammer_Historical_Collection_of_Incandescent_Electric_Lamps?action=edit&amp;redlink=1" id="mwAu0" rel="mw:WikiLink" title="Hammer Historical Collection of Incandescent Electric Lamps" typeof="mw:LocalizedAttrs">a collection of light bulbs</a></b> was bought by <a href="./General_Electric" id="mwAu4" rel="mw:WikiLink" title="General Electric">General Electric</a> in 1912 for $10,000 and by 1931 was valued at over a million dollars?