when were the headphones invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when were the headphones invented	0.45	0.2	9503	36	33
when	1.84	0.2	2267	17	4
were	1.09	0.7	8857	70	4
the	0.77	0.6	7995	58	3
headphones	1.04	0.6	4182	12	10
invented	1.74	1	2792	46	8

Keyword	CPC	PCC	Volume	Score
when were the headphones invented	1.6	0.7	83	28
when were wireless headphones invented	1.66	0.9	4450	49
why were headphones invented	1.29	0.2	1244	96
when were bluetooth headphones invented	0.23	1	4329	35
when were noise canceling headphones invented	0.61	0.6	5512	40
what year were headphones invented	0.5	0.1	4385	25
where were headphones invented	1.14	0.8	7174	20
when were the first headphones invented	0.03	0.5	8860	64
when were headphones invented for music	0.98	0.7	7830	46
why were wireless headphones invented	1.1	0.4	3576	85
who created wireless headphones	1.09	0.3	4837	15
when was wireless earphones invented	1.34	0.2	8177	26
the first wireless headphones	1.43	0.2	4267	43
when were headphones invented	1.62	0.4	7524	79
history timeline of wireless headphones	0.48	0.2	5116	14
when were headphones created	0.99	0.1	2335	91
the history of headphones	1.59	0.6	4958	63