Question at position 7 The world’s first vacuum cleaner was developed by Murray Spangler.TrueFalse

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Question at position 7 The world’s first vacuum cleaner was developed by Murray Spangler.TrueFalse

BlackTom AI · Accepted Answer

Reframing the prompt in my own words: the question asks to evaluate the statement 'The world’s first vacuum cleaner was developed by Murray Spangler' and choose True or False. 
Option 1: True. The claim asserts that Murray Spangler developed the world’s first vacuum cleaner. Historically, Spangler did create a notable early portable vacuum in 1907 and his design led to commercial models, but whether it was the absolute first vacuum cleaner ever made is contested, as there were earlier manual and other primitive cleaning devices. This uncertainty means the statement is not unambiguously true in all historical accounts, which can lead to classroom or test conventions marking it as not definitively the world’s first. 
Option 2: False. This option denies that Murray Spangler developed the world’s first vacuum cleaner. If the test material takes the position that another inventor or earlier device predates Spangler’s design, then this choice aligns with that interpretation. It also accommodates the nuance that invention history can be debated, and the phrase 'world’s first' may be oversimplified in curricula. 
Why the two options diverge: one must weigh what counts as 'the world’s first'—whether Spangler’s 1907 creation is considered the inaugural device or whether earlier, less well-documented devices exist. Some sources credit Spangler with initiating practical, mass-producible vacuums, while others point to pre-Spangler attempts or different definitions of what constitutes a vacuum cleaner. This ambiguity is why the statement is not universally deemed true in all references. 
In the context of the given answer key, the selected option is False. This suggests the material treats the claim as incorrect, possibly due to the reasons above about definitional scope or competing historical attributions. 
Why the other option is considered incorrect in this key: If one asserts True, one is affirming that Spangler unquestionably created the world’s first vacuum cleaner, which the key disagrees with, likely due to historical nuance or alternative attributions mentioned in the source material. 
Note on potential misconceptions: A common misconception is to equate 'the first vacuum cleaner' with the earliest model ever built; however, early cleaning devices did not resemble modern vacuums, and definitions vary. Additionally, even when Spangler’s design was pivotal, that does not automatically guarantee it holds the official claim of being the world’s first vacuum cleaner in every scholarly or educational framing. 
Summary of reasoning: the statement’s truth depends on historical definitions. The provided answer key marks False, interpreting the claim as not definitively establishing Spangler as the inventor of the world’s first vacuum cleaner, given possible earlier devices or differing criteria. This explains why selecting False is consistent with the given answer.

Question at position 7 The world’s first vacuum cleaner was developed by Murray Spangler.TrueFalse

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